diff --git a/lib/main.dart b/lib/main.dart
index 7bbaa237c..ed07ea752 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -6,6 +6,7 @@ import 'package:aves/widgets/welcome_page.dart';
 import 'package:firebase_crashlytics/firebase_crashlytics.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
+import 'package:overlay_support/overlay_support.dart';
 
 void main() {
 //  HttpClient.enableTimelineLogging = true; // enable network traffic logging
@@ -41,34 +42,36 @@ class _AvesAppState extends State<AvesApp> {
     // place the settings provider above `MaterialApp`
     // so it can be used during navigation transitions
     return SettingsProvider(
-      child: MaterialApp(
-        title: 'Aves',
-        theme: ThemeData(
-          brightness: Brightness.dark,
-          accentColor: accentColor,
-          scaffoldBackgroundColor: Colors.grey[900],
-          buttonColor: accentColor,
-          toggleableActiveColor: accentColor,
-          tooltipTheme: TooltipThemeData(
-            verticalOffset: 32,
-          ),
-          appBarTheme: AppBarTheme(
-            textTheme: TextTheme(
-              headline6: TextStyle(
-                fontSize: 20,
-                fontWeight: FontWeight.bold,
-                fontFamily: 'Concourse Caps',
+      child: OverlaySupport(
+        child: MaterialApp(
+          title: 'Aves',
+          theme: ThemeData(
+            brightness: Brightness.dark,
+            accentColor: accentColor,
+            scaffoldBackgroundColor: Colors.grey[900],
+            buttonColor: accentColor,
+            toggleableActiveColor: accentColor,
+            tooltipTheme: TooltipThemeData(
+              verticalOffset: 32,
+            ),
+            appBarTheme: AppBarTheme(
+              textTheme: TextTheme(
+                headline6: TextStyle(
+                  fontSize: 20,
+                  fontWeight: FontWeight.bold,
+                  fontFamily: 'Concourse Caps',
+                ),
               ),
             ),
           ),
-        ),
-        home: FutureBuilder<void>(
-          future: _appSetup,
-          builder: (context, snapshot) {
-            if (snapshot.hasError) return Icon(AIcons.error);
-            if (snapshot.connectionState != ConnectionState.done) return Scaffold();
-            return settings.hasAcceptedTerms ? HomePage() : WelcomePage();
-          },
+          home: FutureBuilder<void>(
+            future: _appSetup,
+            builder: (context, snapshot) {
+              if (snapshot.hasError) return Icon(AIcons.error);
+              if (snapshot.connectionState != ConnectionState.done) return Scaffold();
+              return settings.hasAcceptedTerms ? HomePage() : WelcomePage();
+            },
+          ),
         ),
       ),
     );
diff --git a/lib/model/settings.dart b/lib/model/settings.dart
index f99b3e77c..97b2116e2 100644
--- a/lib/model/settings.dart
+++ b/lib/model/settings.dart
@@ -16,18 +16,27 @@ class Settings extends ChangeNotifier {
 
   Settings._private();
 
-  // preferences
+  // app
+  static const hasAcceptedTermsKey = 'has_accepted_terms';
+  static const mustBackTwiceToExitKey = 'must_back_twice_to_exit';
+  static const homePageKey = 'home_page';
   static const catalogTimeZoneKey = 'catalog_time_zone';
+
+  // collection
   static const collectionGroupFactorKey = 'collection_group_factor';
   static const collectionSortFactorKey = 'collection_sort_factor';
   static const collectionTileExtentKey = 'collection_tile_extent';
-  static const hasAcceptedTermsKey = 'has_accepted_terms';
+
+  // filter grids
+  static const albumSortFactorKey = 'album_sort_factor';
+
+  // info
   static const infoMapStyleKey = 'info_map_style';
   static const infoMapZoomKey = 'info_map_zoom';
-  static const launchPageKey = 'launch_page';
   static const coordinateFormatKey = 'coordinates_format';
+
+  // rendering
   static const svgBackgroundKey = 'svg_background';
-  static const albumSortFactorKey = 'album_sort_factor';
 
   Future<void> init() async {
     _prefs = await SharedPreferences.getInstance();
@@ -37,10 +46,26 @@ class Settings extends ChangeNotifier {
     return _prefs.clear();
   }
 
+  // app
+
+  bool get hasAcceptedTerms => getBoolOrDefault(hasAcceptedTermsKey, false);
+
+  set hasAcceptedTerms(bool newValue) => setAndNotify(hasAcceptedTermsKey, newValue);
+
+  bool get mustBackTwiceToExit => getBoolOrDefault(mustBackTwiceToExitKey, true);
+
+  set mustBackTwiceToExit(bool newValue) => setAndNotify(mustBackTwiceToExitKey, newValue);
+
+  HomePageSetting get homePage => getEnumOrDefault(homePageKey, HomePageSetting.collection, HomePageSetting.values);
+
+  set homePage(HomePageSetting newValue) => setAndNotify(homePageKey, newValue.toString());
+
   String get catalogTimeZone => _prefs.getString(catalogTimeZoneKey) ?? '';
 
   set catalogTimeZone(String newValue) => setAndNotify(catalogTimeZoneKey, newValue);
 
+  // collection
+
   EntryGroupFactor get collectionGroupFactor => getEnumOrDefault(collectionGroupFactorKey, EntryGroupFactor.month, EntryGroupFactor.values);
 
   set collectionGroupFactor(EntryGroupFactor newValue) => setAndNotify(collectionGroupFactorKey, newValue.toString());
@@ -53,6 +78,14 @@ class Settings extends ChangeNotifier {
 
   set collectionTileExtent(double newValue) => setAndNotify(collectionTileExtentKey, newValue);
 
+  // filter grids
+
+  ChipSortFactor get albumSortFactor => getEnumOrDefault(albumSortFactorKey, ChipSortFactor.name, ChipSortFactor.values);
+
+  set albumSortFactor(ChipSortFactor newValue) => setAndNotify(albumSortFactorKey, newValue.toString());
+
+  // info
+
   EntryMapStyle get infoMapStyle => getEnumOrDefault(infoMapStyleKey, EntryMapStyle.stamenWatercolor, EntryMapStyle.values);
 
   set infoMapStyle(EntryMapStyle newValue) => setAndNotify(infoMapStyleKey, newValue.toString());
@@ -61,26 +94,16 @@ class Settings extends ChangeNotifier {
 
   set infoMapZoom(double newValue) => setAndNotify(infoMapZoomKey, newValue);
 
-  bool get hasAcceptedTerms => getBoolOrDefault(hasAcceptedTermsKey, false);
-
-  set hasAcceptedTerms(bool newValue) => setAndNotify(hasAcceptedTermsKey, newValue);
-
-  LaunchPage get launchPage => getEnumOrDefault(launchPageKey, LaunchPage.collection, LaunchPage.values);
-
-  set launchPage(LaunchPage newValue) => setAndNotify(launchPageKey, newValue.toString());
-
   CoordinateFormat get coordinateFormat => getEnumOrDefault(coordinateFormatKey, CoordinateFormat.dms, CoordinateFormat.values);
 
   set coordinateFormat(CoordinateFormat newValue) => setAndNotify(coordinateFormatKey, newValue.toString());
 
+  // rendering
+
   int get svgBackground => _prefs.getInt(svgBackgroundKey) ?? 0xFFFFFFFF;
 
   set svgBackground(int newValue) => setAndNotify(svgBackgroundKey, newValue);
 
-  ChipSortFactor get albumSortFactor => getEnumOrDefault(albumSortFactorKey, ChipSortFactor.date, ChipSortFactor.values);
-
-  set albumSortFactor(ChipSortFactor newValue) => setAndNotify(albumSortFactorKey, newValue.toString());
-
   // convenience methods
 
   // ignore: avoid_positional_boolean_parameters
@@ -126,14 +149,14 @@ class Settings extends ChangeNotifier {
   }
 }
 
-enum LaunchPage { collection, albums }
+enum HomePageSetting { collection, albums }
 
-extension ExtraLaunchPage on LaunchPage {
+extension ExtraHomePageSetting on HomePageSetting {
   String get name {
     switch (this) {
-      case LaunchPage.collection:
+      case HomePageSetting.collection:
         return 'All Media';
-      case LaunchPage.albums:
+      case HomePageSetting.albums:
         return 'Albums';
       default:
         return toString();
diff --git a/lib/utils/constants.dart b/lib/utils/constants.dart
index 32158651d..658ff6763 100644
--- a/lib/utils/constants.dart
+++ b/lib/utils/constants.dart
@@ -10,13 +10,6 @@ class Constants {
     color: Color(0xFFEEEEEE),
     fontSize: 20,
     fontFamily: 'Concourse Caps',
-    shadows: [
-      Shadow(
-        offset: Offset(0, 2),
-        blurRadius: 3,
-        color: Color(0xFF212121),
-      ),
-    ],
   );
 
   static const List<Dependency> androidDependencies = [
diff --git a/lib/utils/durations.dart b/lib/utils/durations.dart
index 3bb1e1a4d..f4d7c2a26 100644
--- a/lib/utils/durations.dart
+++ b/lib/utils/durations.dart
@@ -31,4 +31,5 @@ class Durations {
   static const collectionScalingCompleteNotificationDelay = Duration(milliseconds: 300);
   static const videoProgressTimerInterval = Duration(milliseconds: 300);
   static Duration staggeredAnimationDelay = Durations.staggeredAnimation ~/ 6 * timeDilation;
+  static const doubleBackTimerDelay = Duration(milliseconds: 1000);
 }
diff --git a/lib/widgets/album/app_bar.dart b/lib/widgets/album/app_bar.dart
index fc370dfcc..bb7d9fade 100644
--- a/lib/widgets/album/app_bar.dart
+++ b/lib/widgets/album/app_bar.dart
@@ -7,10 +7,9 @@ import 'package:aves/model/source/enums.dart';
 import 'package:aves/utils/durations.dart';
 import 'package:aves/widgets/album/filter_bar.dart';
 import 'package:aves/widgets/album/search/search_delegate.dart';
-import 'package:aves/widgets/common/action_delegates/collection_group_dialog.dart';
-import 'package:aves/widgets/common/action_delegates/collection_sort_dialog.dart';
 import 'package:aves/widgets/common/action_delegates/selection_action_delegate.dart';
 import 'package:aves/widgets/common/app_bar_subtitle.dart';
+import 'package:aves/widgets/common/aves_selection_dialog.dart';
 import 'package:aves/widgets/common/data_providers/media_store_collection_provider.dart';
 import 'package:aves/widgets/common/entry_actions.dart';
 import 'package:aves/widgets/common/icons.dart';
@@ -296,23 +295,40 @@ class _CollectionAppBarState extends State<CollectionAppBar> with SingleTickerPr
         unawaited(_goToStats());
         break;
       case CollectionAction.group:
-        final factor = await showDialog<EntryGroupFactor>(
+        final value = await showDialog<EntryGroupFactor>(
           context: context,
-          builder: (context) => CollectionGroupDialog(),
+          builder: (context) => AvesSelectionDialog<EntryGroupFactor>(
+            initialValue: settings.collectionGroupFactor,
+            options: {
+              EntryGroupFactor.album: 'By album',
+              EntryGroupFactor.month: 'By month',
+              EntryGroupFactor.day: 'By day',
+              EntryGroupFactor.none: 'Do not group',
+            },
+            title: 'Group',
+          ),
         );
-        if (factor != null) {
-          settings.collectionGroupFactor = factor;
-          collection.group(factor);
+        if (value != null) {
+          settings.collectionGroupFactor = value;
+          collection.group(value);
         }
         break;
       case CollectionAction.sort:
-        final factor = await showDialog<EntrySortFactor>(
+        final value = await showDialog<EntrySortFactor>(
           context: context,
-          builder: (context) => CollectionSortDialog(initialValue: settings.collectionSortFactor),
+          builder: (context) => AvesSelectionDialog<EntrySortFactor>(
+            initialValue: settings.collectionSortFactor,
+            options: {
+              EntrySortFactor.date: 'By date',
+              EntrySortFactor.size: 'By size',
+              EntrySortFactor.name: 'By album & file name',
+            },
+            title: 'Sort',
+          ),
         );
-        if (factor != null) {
-          settings.collectionSortFactor = factor;
-          collection.sort(factor);
+        if (value != null) {
+          settings.collectionSortFactor = value;
+          collection.sort(value);
         }
         break;
     }
diff --git a/lib/widgets/album/collection_page.dart b/lib/widgets/album/collection_page.dart
index d1c942e0a..7349dc8ef 100644
--- a/lib/widgets/album/collection_page.dart
+++ b/lib/widgets/album/collection_page.dart
@@ -2,6 +2,7 @@ import 'package:aves/model/source/collection_lens.dart';
 import 'package:aves/widgets/album/thumbnail_collection.dart';
 import 'package:aves/widgets/app_drawer.dart';
 import 'package:aves/widgets/common/data_providers/media_query_data_provider.dart';
+import 'package:aves/widgets/common/double_back_pop.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
@@ -26,7 +27,9 @@ class CollectionPage extends StatelessWidget {
               }
               return SynchronousFuture(true);
             },
-            child: ThumbnailCollection(),
+            child: DoubleBackPopScope(
+              child: ThumbnailCollection(),
+            ),
           ),
           drawer: AppDrawer(
             source: collection.source,
diff --git a/lib/widgets/common/action_delegates/chip_sort_dialog.dart b/lib/widgets/common/action_delegates/chip_sort_dialog.dart
deleted file mode 100644
index 9308343b4..000000000
--- a/lib/widgets/common/action_delegates/chip_sort_dialog.dart
+++ /dev/null
@@ -1,59 +0,0 @@
-import 'package:aves/model/source/enums.dart';
-import 'package:flutter/material.dart';
-import 'package:flutter/widgets.dart';
-
-import '../dialog.dart';
-
-class ChipSortDialog extends StatefulWidget {
-  final ChipSortFactor initialValue;
-
-  const ChipSortDialog({@required this.initialValue});
-
-  @override
-  _ChipSortDialogState createState() => _ChipSortDialogState();
-}
-
-class _ChipSortDialogState extends State<ChipSortDialog> {
-  ChipSortFactor _selectedSort;
-
-  @override
-  void initState() {
-    super.initState();
-    _selectedSort = widget.initialValue;
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    return AvesDialog(
-      title: 'Sort',
-      scrollableContent: [
-        _buildRadioListTile(ChipSortFactor.date, 'By date'),
-        _buildRadioListTile(ChipSortFactor.name, 'By name'),
-      ],
-      actions: [
-        FlatButton(
-          onPressed: () => Navigator.pop(context),
-          child: Text('Cancel'.toUpperCase()),
-        ),
-        FlatButton(
-          key: Key('apply-button'),
-          onPressed: () => Navigator.pop(context, _selectedSort),
-          child: Text('Apply'.toUpperCase()),
-        ),
-      ],
-    );
-  }
-
-  Widget _buildRadioListTile(ChipSortFactor value, String title) => RadioListTile<ChipSortFactor>(
-        key: Key(value.toString()),
-        value: value,
-        groupValue: _selectedSort,
-        onChanged: (sort) => setState(() => _selectedSort = sort),
-        title: Text(
-          title,
-          softWrap: false,
-          overflow: TextOverflow.fade,
-          maxLines: 1,
-        ),
-      );
-}
diff --git a/lib/widgets/common/action_delegates/collection_group_dialog.dart b/lib/widgets/common/action_delegates/collection_group_dialog.dart
deleted file mode 100644
index 66f898734..000000000
--- a/lib/widgets/common/action_delegates/collection_group_dialog.dart
+++ /dev/null
@@ -1,58 +0,0 @@
-import 'package:aves/model/settings.dart';
-import 'package:aves/model/source/enums.dart';
-import 'package:flutter/material.dart';
-import 'package:flutter/widgets.dart';
-
-import '../dialog.dart';
-
-class CollectionGroupDialog extends StatefulWidget {
-  @override
-  _CollectionGroupDialogState createState() => _CollectionGroupDialogState();
-}
-
-class _CollectionGroupDialogState extends State<CollectionGroupDialog> {
-  EntryGroupFactor _selectedGroup;
-
-  @override
-  void initState() {
-    super.initState();
-    _selectedGroup = settings.collectionGroupFactor;
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    return AvesDialog(
-      title: 'Group',
-      scrollableContent: [
-        _buildRadioListTile(EntryGroupFactor.album, 'By album'),
-        _buildRadioListTile(EntryGroupFactor.month, 'By month'),
-        _buildRadioListTile(EntryGroupFactor.day, 'By day'),
-        _buildRadioListTile(EntryGroupFactor.none, 'Do not group'),
-      ],
-      actions: [
-        FlatButton(
-          onPressed: () => Navigator.pop(context),
-          child: Text('Cancel'.toUpperCase()),
-        ),
-        FlatButton(
-          key: Key('apply-button'),
-          onPressed: () => Navigator.pop(context, _selectedGroup),
-          child: Text('Apply'.toUpperCase()),
-        ),
-      ],
-    );
-  }
-
-  Widget _buildRadioListTile(EntryGroupFactor value, String title) => RadioListTile<EntryGroupFactor>(
-        key: Key(value.toString()),
-        value: value,
-        groupValue: _selectedGroup,
-        onChanged: (group) => setState(() => _selectedGroup = group),
-        title: Text(
-          title,
-          softWrap: false,
-          overflow: TextOverflow.fade,
-          maxLines: 1,
-        ),
-      );
-}
diff --git a/lib/widgets/common/action_delegates/collection_sort_dialog.dart b/lib/widgets/common/action_delegates/collection_sort_dialog.dart
deleted file mode 100644
index 302ef203b..000000000
--- a/lib/widgets/common/action_delegates/collection_sort_dialog.dart
+++ /dev/null
@@ -1,60 +0,0 @@
-import 'package:aves/model/source/enums.dart';
-import 'package:flutter/material.dart';
-import 'package:flutter/widgets.dart';
-
-import '../dialog.dart';
-
-class CollectionSortDialog extends StatefulWidget {
-  final EntrySortFactor initialValue;
-
-  const CollectionSortDialog({@required this.initialValue});
-
-  @override
-  _CollectionSortDialogState createState() => _CollectionSortDialogState();
-}
-
-class _CollectionSortDialogState extends State<CollectionSortDialog> {
-  EntrySortFactor _selectedSort;
-
-  @override
-  void initState() {
-    super.initState();
-    _selectedSort = widget.initialValue;
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    return AvesDialog(
-      title: 'Sort',
-      scrollableContent: [
-        _buildRadioListTile(EntrySortFactor.date, 'By date'),
-        _buildRadioListTile(EntrySortFactor.size, 'By size'),
-        _buildRadioListTile(EntrySortFactor.name, 'By album & file name'),
-      ],
-      actions: [
-        FlatButton(
-          onPressed: () => Navigator.pop(context),
-          child: Text('Cancel'.toUpperCase()),
-        ),
-        FlatButton(
-          key: Key('apply-button'),
-          onPressed: () => Navigator.pop(context, _selectedSort),
-          child: Text('Apply'.toUpperCase()),
-        ),
-      ],
-    );
-  }
-
-  Widget _buildRadioListTile(EntrySortFactor value, String title) => RadioListTile<EntrySortFactor>(
-        key: Key(value.toString()),
-        value: value,
-        groupValue: _selectedSort,
-        onChanged: (sort) => setState(() => _selectedSort = sort),
-        title: Text(
-          title,
-          softWrap: false,
-          overflow: TextOverflow.fade,
-          maxLines: 1,
-        ),
-      );
-}
diff --git a/lib/widgets/common/action_delegates/create_album_dialog.dart b/lib/widgets/common/action_delegates/create_album_dialog.dart
index a32dfcf53..801255497 100644
--- a/lib/widgets/common/action_delegates/create_album_dialog.dart
+++ b/lib/widgets/common/action_delegates/create_album_dialog.dart
@@ -5,7 +5,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter/widgets.dart';
 import 'package:path/path.dart';
 
-import '../dialog.dart';
+import '../aves_dialog.dart';
 
 class CreateAlbumDialog extends StatefulWidget {
   @override
diff --git a/lib/widgets/common/action_delegates/entry_action_delegate.dart b/lib/widgets/common/action_delegates/entry_action_delegate.dart
index ad52a6441..368acd591 100644
--- a/lib/widgets/common/action_delegates/entry_action_delegate.dart
+++ b/lib/widgets/common/action_delegates/entry_action_delegate.dart
@@ -7,7 +7,7 @@ import 'package:aves/services/image_file_service.dart';
 import 'package:aves/widgets/common/action_delegates/feedback.dart';
 import 'package:aves/widgets/common/action_delegates/permission_aware.dart';
 import 'package:aves/widgets/common/action_delegates/rename_entry_dialog.dart';
-import 'package:aves/widgets/common/dialog.dart';
+import 'package:aves/widgets/common/aves_dialog.dart';
 import 'package:aves/widgets/common/entry_actions.dart';
 import 'package:aves/widgets/common/image_providers/uri_image_provider.dart';
 import 'package:aves/widgets/fullscreen/debug.dart';
diff --git a/lib/widgets/common/action_delegates/map_style_dialog.dart b/lib/widgets/common/action_delegates/map_style_dialog.dart
deleted file mode 100644
index a9b0fd3d2..000000000
--- a/lib/widgets/common/action_delegates/map_style_dialog.dart
+++ /dev/null
@@ -1,51 +0,0 @@
-import 'package:aves/model/settings.dart';
-import 'package:aves/widgets/fullscreen/info/location_section.dart';
-import 'package:flutter/material.dart';
-import 'package:flutter/widgets.dart';
-
-import '../dialog.dart';
-
-class MapStyleDialog extends StatefulWidget {
-  @override
-  _MapStyleDialogState createState() => _MapStyleDialogState();
-}
-
-class _MapStyleDialogState extends State<MapStyleDialog> {
-  EntryMapStyle _selectedStyle;
-
-  @override
-  void initState() {
-    super.initState();
-    _selectedStyle = settings.infoMapStyle;
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    return AvesDialog(
-      title: 'Map Style',
-      scrollableContent: EntryMapStyle.values.map((style) => _buildRadioListTile(style, style.name)).toList(),
-      actions: [
-        FlatButton(
-          onPressed: () => Navigator.pop(context),
-          child: Text('Cancel'.toUpperCase()),
-        ),
-        FlatButton(
-          onPressed: () => Navigator.pop(context, _selectedStyle),
-          child: Text('Apply'.toUpperCase()),
-        ),
-      ],
-    );
-  }
-
-  Widget _buildRadioListTile(EntryMapStyle style, String title) => RadioListTile<EntryMapStyle>(
-        value: style,
-        groupValue: _selectedStyle,
-        onChanged: (style) => setState(() => _selectedStyle = style),
-        title: Text(
-          title,
-          softWrap: false,
-          overflow: TextOverflow.fade,
-          maxLines: 1,
-        ),
-      );
-}
diff --git a/lib/widgets/common/action_delegates/permission_aware.dart b/lib/widgets/common/action_delegates/permission_aware.dart
index d1df692b5..b020c627e 100644
--- a/lib/widgets/common/action_delegates/permission_aware.dart
+++ b/lib/widgets/common/action_delegates/permission_aware.dart
@@ -2,7 +2,7 @@ import 'package:aves/model/image_entry.dart';
 import 'package:aves/services/android_file_service.dart';
 import 'package:flutter/material.dart';
 
-import '../dialog.dart';
+import '../aves_dialog.dart';
 
 mixin PermissionAwareMixin {
   Future<bool> checkStoragePermission(BuildContext context, Iterable<ImageEntry> entries) {
diff --git a/lib/widgets/common/action_delegates/rename_entry_dialog.dart b/lib/widgets/common/action_delegates/rename_entry_dialog.dart
index 33cee0309..4e3106a47 100644
--- a/lib/widgets/common/action_delegates/rename_entry_dialog.dart
+++ b/lib/widgets/common/action_delegates/rename_entry_dialog.dart
@@ -1,7 +1,8 @@
 import 'package:aves/model/image_entry.dart';
-import 'package:aves/widgets/common/dialog.dart';
 import 'package:flutter/material.dart';
 
+import '../aves_dialog.dart';
+
 class RenameEntryDialog extends StatefulWidget {
   final ImageEntry entry;
 
diff --git a/lib/widgets/common/action_delegates/selection_action_delegate.dart b/lib/widgets/common/action_delegates/selection_action_delegate.dart
index 24faeadee..b3bf36570 100644
--- a/lib/widgets/common/action_delegates/selection_action_delegate.dart
+++ b/lib/widgets/common/action_delegates/selection_action_delegate.dart
@@ -14,7 +14,7 @@ import 'package:aves/widgets/album/empty.dart';
 import 'package:aves/widgets/common/action_delegates/create_album_dialog.dart';
 import 'package:aves/widgets/common/action_delegates/feedback.dart';
 import 'package:aves/widgets/common/action_delegates/permission_aware.dart';
-import 'package:aves/widgets/common/dialog.dart';
+import 'package:aves/widgets/common/aves_dialog.dart';
 import 'package:aves/widgets/common/entry_actions.dart';
 import 'package:aves/widgets/common/icons.dart';
 import 'package:aves/widgets/filter_grids/filter_grid_page.dart';
diff --git a/lib/widgets/common/dialog.dart b/lib/widgets/common/aves_dialog.dart
similarity index 100%
rename from lib/widgets/common/dialog.dart
rename to lib/widgets/common/aves_dialog.dart
diff --git a/lib/widgets/common/aves_selection_dialog.dart b/lib/widgets/common/aves_selection_dialog.dart
new file mode 100644
index 000000000..4165183ba
--- /dev/null
+++ b/lib/widgets/common/aves_selection_dialog.dart
@@ -0,0 +1,61 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
+
+import 'aves_dialog.dart';
+
+class AvesSelectionDialog<T> extends StatefulWidget {
+  final T initialValue;
+  final Map<T, String> options;
+  final String title;
+
+  const AvesSelectionDialog({
+    @required this.initialValue,
+    @required this.options,
+    @required this.title,
+  });
+
+  @override
+  _AvesSelectionDialogState<T> createState() => _AvesSelectionDialogState<T>();
+}
+
+class _AvesSelectionDialogState<T> extends State<AvesSelectionDialog> {
+  T _selectedValue;
+
+  @override
+  void initState() {
+    super.initState();
+    _selectedValue = widget.initialValue;
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return AvesDialog(
+      title: widget.title,
+      scrollableContent: widget.options.entries.map((kv) => _buildRadioListTile(kv.key, kv.value)).toList(),
+      actions: [
+        FlatButton(
+          onPressed: () => Navigator.pop(context),
+          child: Text('Cancel'.toUpperCase()),
+        ),
+        FlatButton(
+          key: Key('apply-button'),
+          onPressed: () => Navigator.pop(context, _selectedValue),
+          child: Text('Apply'.toUpperCase()),
+        ),
+      ],
+    );
+  }
+
+  Widget _buildRadioListTile(T value, String title) => RadioListTile<T>(
+        key: Key(value.toString()),
+        value: value,
+        groupValue: _selectedValue,
+        onChanged: (v) => setState(() => _selectedValue = v),
+        title: Text(
+          title,
+          softWrap: false,
+          overflow: TextOverflow.fade,
+          maxLines: 1,
+        ),
+      );
+}
diff --git a/lib/widgets/common/double_back_pop.dart b/lib/widgets/common/double_back_pop.dart
new file mode 100644
index 000000000..583a9563f
--- /dev/null
+++ b/lib/widgets/common/double_back_pop.dart
@@ -0,0 +1,54 @@
+import 'dart:async';
+
+import 'package:aves/model/settings.dart';
+import 'package:aves/utils/durations.dart';
+import 'package:aves/widgets/common/action_delegates/feedback.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:overlay_support/overlay_support.dart';
+
+class DoubleBackPopScope extends StatefulWidget {
+  final Widget child;
+
+  const DoubleBackPopScope({
+    @required this.child,
+  });
+
+  @override
+  _DoubleBackPopScopeState createState() => _DoubleBackPopScopeState();
+}
+
+class _DoubleBackPopScopeState extends State<DoubleBackPopScope> with FeedbackMixin {
+  bool _backOnce = false;
+  Timer _backTimer;
+
+  @override
+  void dispose() {
+    _stopBackTimer();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return WillPopScope(
+      onWillPop: () {
+        if (!Navigator.of(context).canPop() && settings.mustBackTwiceToExit && !_backOnce) {
+          _backOnce = true;
+          _stopBackTimer();
+          _backTimer = Timer(Durations.doubleBackTimerDelay, () => _backOnce = false);
+          toast(
+            'Tap “back” again to exit.',
+            duration: Durations.doubleBackTimerDelay,
+          );
+          return SynchronousFuture(false);
+        }
+        return SynchronousFuture(true);
+      },
+      child: widget.child,
+    );
+  }
+
+  void _stopBackTimer() {
+    _backTimer?.cancel();
+  }
+}
diff --git a/lib/widgets/common/highlight_title.dart b/lib/widgets/common/highlight_title.dart
new file mode 100644
index 000000000..1fbb5cab7
--- /dev/null
+++ b/lib/widgets/common/highlight_title.dart
@@ -0,0 +1,43 @@
+import 'package:aves/utils/color_utils.dart';
+import 'package:aves/widgets/common/fx/highlight_decoration.dart';
+import 'package:flutter/material.dart';
+
+class HighlightTitle extends StatelessWidget {
+  final String name;
+  final double fontSize;
+
+  const HighlightTitle(
+    this.name, {
+    this.fontSize = 20,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Align(
+      alignment: AlignmentDirectional.centerStart,
+      child: Container(
+        decoration: HighlightDecoration(
+          color: stringToColor(name),
+        ),
+        margin: EdgeInsets.symmetric(vertical: 4.0),
+        child: Text(
+          name,
+          style: TextStyle(
+            shadows: [
+              Shadow(
+                color: Colors.black,
+                offset: Offset(1, 1),
+                blurRadius: 2,
+              )
+            ],
+            fontSize: fontSize,
+            fontFamily: 'Concourse Caps',
+          ),
+          softWrap: false,
+          overflow: TextOverflow.fade,
+          maxLines: 1,
+        ),
+      ),
+    );
+  }
+}
diff --git a/lib/widgets/filter_grids/albums_page.dart b/lib/widgets/filter_grids/albums_page.dart
index 67078e0d8..b696941e3 100644
--- a/lib/widgets/filter_grids/albums_page.dart
+++ b/lib/widgets/filter_grids/albums_page.dart
@@ -7,7 +7,7 @@ import 'package:aves/model/source/enums.dart';
 import 'package:aves/utils/android_file_utils.dart';
 import 'package:aves/utils/durations.dart';
 import 'package:aves/widgets/album/empty.dart';
-import 'package:aves/widgets/common/action_delegates/chip_sort_dialog.dart';
+import 'package:aves/widgets/common/aves_selection_dialog.dart';
 import 'package:aves/widgets/common/icons.dart';
 import 'package:aves/widgets/common/menu_row.dart';
 import 'package:aves/widgets/filter_grids/filter_grid_page.dart';
@@ -117,7 +117,14 @@ class AlbumListPage extends StatelessWidget {
       case ChipAction.sort:
         final factor = await showDialog<ChipSortFactor>(
           context: context,
-          builder: (context) => ChipSortDialog(initialValue: settings.albumSortFactor),
+          builder: (context) => AvesSelectionDialog<ChipSortFactor>(
+            initialValue: settings.albumSortFactor,
+            options: {
+              ChipSortFactor.date: 'By date',
+              ChipSortFactor.name: 'By name',
+            },
+            title: 'Sort',
+          ),
         );
         if (factor != null) {
           settings.albumSortFactor = factor;
diff --git a/lib/widgets/fullscreen/info/maps/common.dart b/lib/widgets/fullscreen/info/maps/common.dart
index 3440a6665..7cbb51131 100644
--- a/lib/widgets/fullscreen/info/maps/common.dart
+++ b/lib/widgets/fullscreen/info/maps/common.dart
@@ -1,6 +1,6 @@
 import 'package:aves/model/settings.dart';
 import 'package:aves/services/android_app_service.dart';
-import 'package:aves/widgets/common/action_delegates/map_style_dialog.dart';
+import 'package:aves/widgets/common/aves_selection_dialog.dart';
 import 'package:aves/widgets/common/borders.dart';
 import 'package:aves/widgets/common/fx/blurred.dart';
 import 'package:aves/widgets/common/icons.dart';
@@ -70,7 +70,11 @@ class MapButtonPanel extends StatelessWidget {
                   onPressed: () async {
                     final style = await showDialog<EntryMapStyle>(
                       context: context,
-                      builder: (context) => MapStyleDialog(),
+                      builder: (context) => AvesSelectionDialog<EntryMapStyle>(
+                        initialValue: settings.infoMapStyle,
+                        options: Map.fromEntries(EntryMapStyle.values.map((v) => MapEntry(v, v.name))),
+                        title: 'Map Style',
+                      ),
                     );
                     if (style != null) {
                       settings.infoMapStyle = style;
diff --git a/lib/widgets/fullscreen/info/metadata_section.dart b/lib/widgets/fullscreen/info/metadata_section.dart
index fb3cf769e..11bfda26d 100644
--- a/lib/widgets/fullscreen/info/metadata_section.dart
+++ b/lib/widgets/fullscreen/info/metadata_section.dart
@@ -3,8 +3,7 @@ import 'dart:collection';
 
 import 'package:aves/model/image_entry.dart';
 import 'package:aves/services/metadata_service.dart';
-import 'package:aves/utils/color_utils.dart';
-import 'package:aves/widgets/common/fx/highlight_decoration.dart';
+import 'package:aves/widgets/common/highlight_title.dart';
 import 'package:aves/widgets/common/icons.dart';
 import 'package:aves/widgets/fullscreen/info/info_page.dart';
 import 'package:expansion_tile_card/expansion_tile_card.dart';
@@ -90,7 +89,10 @@ class _MetadataSectionSliverState extends State<MetadataSectionSliver> with Auto
               key: Key('tilecard-${dir.name}'),
               value: dir.name,
               expandedNotifier: _expandedDirectoryNotifier,
-              title: _DirectoryTitle(dir.name),
+              title: HighlightTitle(
+                dir.name,
+                fontSize: 18,
+              ),
               children: [
                 Divider(thickness: 1.0, height: 1.0),
                 Container(
@@ -138,42 +140,6 @@ class _MetadataSectionSliverState extends State<MetadataSectionSliver> with Auto
   bool get wantKeepAlive => true;
 }
 
-class _DirectoryTitle extends StatelessWidget {
-  final String name;
-
-  const _DirectoryTitle(this.name);
-
-  @override
-  Widget build(BuildContext context) {
-    return Align(
-      alignment: Alignment.centerLeft,
-      child: Container(
-        decoration: HighlightDecoration(
-          color: stringToColor(name),
-        ),
-        margin: EdgeInsets.symmetric(vertical: 4.0),
-        child: Text(
-          name,
-          style: TextStyle(
-            shadows: [
-              Shadow(
-                color: Colors.black,
-                offset: Offset(1, 1),
-                blurRadius: 2,
-              )
-            ],
-            fontSize: 18,
-            fontFamily: 'Concourse Caps',
-          ),
-          softWrap: false,
-          overflow: TextOverflow.fade,
-          maxLines: 1,
-        ),
-      ),
-    );
-  }
-}
-
 class _MetadataDirectory {
   final String name;
   final SplayTreeMap<String, String> tags;
diff --git a/lib/widgets/home_page.dart b/lib/widgets/home_page.dart
index 05931e7c0..732aa78a0 100644
--- a/lib/widgets/home_page.dart
+++ b/lib/widgets/home_page.dart
@@ -103,11 +103,11 @@ class _HomePageState extends State<HomePage> {
             return SingleFullscreenPage(entry: _viewerEntry);
           }
           if (_mediaStore != null) {
-            switch (settings.launchPage) {
-              case LaunchPage.albums:
+            switch (settings.homePage) {
+              case HomePageSetting.albums:
                 return AlbumListPage(source: _mediaStore);
                 break;
-              case LaunchPage.collection:
+              case HomePageSetting.collection:
                 return CollectionPage(CollectionLens(
                   source: _mediaStore,
                   groupFactor: settings.collectionGroupFactor,
diff --git a/lib/widgets/settings/coordinate_format.dart b/lib/widgets/settings/coordinate_format.dart
deleted file mode 100644
index 47b0d93a2..000000000
--- a/lib/widgets/settings/coordinate_format.dart
+++ /dev/null
@@ -1,31 +0,0 @@
-import 'package:aves/model/settings.dart';
-import 'package:flutter/material.dart';
-
-class CoordinateFormatSelector extends StatefulWidget {
-  @override
-  _CoordinateFormatSelectorState createState() => _CoordinateFormatSelectorState();
-}
-
-class _CoordinateFormatSelectorState extends State<CoordinateFormatSelector> {
-  @override
-  Widget build(BuildContext context) {
-    return DropdownButton<CoordinateFormat>(
-      items: CoordinateFormat.values
-          .map((selected) => DropdownMenuItem(
-                value: selected,
-                child: Text(
-                  selected.name,
-                  softWrap: false,
-                  overflow: TextOverflow.fade,
-                  maxLines: 1,
-                ),
-              ))
-          .toList(),
-      value: settings.coordinateFormat,
-      onChanged: (selected) {
-        settings.coordinateFormat = selected;
-        setState(() {});
-      },
-    );
-  }
-}
diff --git a/lib/widgets/settings/launch_page.dart b/lib/widgets/settings/launch_page.dart
deleted file mode 100644
index 321f4bbbc..000000000
--- a/lib/widgets/settings/launch_page.dart
+++ /dev/null
@@ -1,31 +0,0 @@
-import 'package:aves/model/settings.dart';
-import 'package:flutter/material.dart';
-
-class LaunchPageSelector extends StatefulWidget {
-  @override
-  _LaunchPageSelectorState createState() => _LaunchPageSelectorState();
-}
-
-class _LaunchPageSelectorState extends State<LaunchPageSelector> {
-  @override
-  Widget build(BuildContext context) {
-    return DropdownButton<LaunchPage>(
-      items: LaunchPage.values
-          .map((selected) => DropdownMenuItem(
-                value: selected,
-                child: Text(
-                  selected.name,
-                  softWrap: false,
-                  overflow: TextOverflow.fade,
-                  maxLines: 1,
-                ),
-              ))
-          .toList(),
-      value: settings.launchPage,
-      onChanged: (selected) {
-        settings.launchPage = selected;
-        setState(() {});
-      },
-    );
-  }
-}
diff --git a/lib/widgets/settings/settings_page.dart b/lib/widgets/settings/settings_page.dart
index 2a32044c2..0866c6cae 100644
--- a/lib/widgets/settings/settings_page.dart
+++ b/lib/widgets/settings/settings_page.dart
@@ -1,9 +1,10 @@
-import 'package:aves/utils/constants.dart';
+import 'package:aves/model/settings.dart';
+import 'package:aves/widgets/common/aves_selection_dialog.dart';
 import 'package:aves/widgets/common/data_providers/media_query_data_provider.dart';
-import 'package:aves/widgets/settings/coordinate_format.dart';
-import 'package:aves/widgets/settings/launch_page.dart';
+import 'package:aves/widgets/common/highlight_title.dart';
 import 'package:aves/widgets/settings/svg_background.dart';
 import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
 
 class SettingsPage extends StatelessWidget {
   @override
@@ -16,35 +17,57 @@ class SettingsPage extends StatelessWidget {
             title: Text('Preferences'),
           ),
           body: SafeArea(
-            child: ListView(
-              padding: EdgeInsets.all(16),
-              children: [
-                Text('General', style: Constants.titleTextStyle),
-                Row(
-                  mainAxisSize: MainAxisSize.min,
-                  children: [
-                    Text('Launch page:'),
-                    SizedBox(width: 8),
-                    Flexible(child: LaunchPageSelector()),
-                  ],
-                ),
-                Row(
-                  mainAxisSize: MainAxisSize.min,
-                  children: [
-                    Text('SVG background:'),
-                    SizedBox(width: 8),
-                    Flexible(child: SvgBackgroundSelector()),
-                  ],
-                ),
-                Row(
-                  mainAxisSize: MainAxisSize.min,
-                  children: [
-                    Text('Coordinate format:'),
-                    SizedBox(width: 8),
-                    Flexible(child: CoordinateFormatSelector()),
-                  ],
-                ),
-              ],
+            child: Consumer<Settings>(
+              builder: (context, settings, child) => ListView(
+                padding: EdgeInsets.symmetric(vertical: 16),
+                children: [
+                  SectionTitle('Navigation'),
+                  ListTile(
+                    title: Text('Home'),
+                    subtitle: Text(settings.homePage.name),
+                    onTap: () async {
+                      final value = await showDialog<HomePageSetting>(
+                        context: context,
+                        builder: (context) => AvesSelectionDialog<HomePageSetting>(
+                          initialValue: settings.homePage,
+                          options: Map.fromEntries(HomePageSetting.values.map((v) => MapEntry(v, v.name))),
+                          title: 'Home',
+                        ),
+                      );
+                      if (value != null) {
+                        settings.homePage = value;
+                      }
+                    },
+                  ),
+                  SwitchListTile(
+                    value: settings.mustBackTwiceToExit,
+                    onChanged: (v) => settings.mustBackTwiceToExit = v,
+                    title: Text('Tap “back” twice to exit'),
+                  ),
+                  SectionTitle('Display'),
+                  ListTile(
+                    title: Text('SVG background'),
+                    trailing: SvgBackgroundSelector(),
+                  ),
+                  ListTile(
+                    title: Text('Coordinate format'),
+                    subtitle: Text(settings.coordinateFormat.name),
+                    onTap: () async {
+                      final value = await showDialog<CoordinateFormat>(
+                        context: context,
+                        builder: (context) => AvesSelectionDialog<CoordinateFormat>(
+                          initialValue: settings.coordinateFormat,
+                          options: Map.fromEntries(CoordinateFormat.values.map((v) => MapEntry(v, v.name))),
+                          title: 'Coordinate Format',
+                        ),
+                      );
+                      if (value != null) {
+                        settings.coordinateFormat = value;
+                      }
+                    },
+                  ),
+                ],
+              ),
             ),
           ),
         ),
@@ -52,3 +75,17 @@ class SettingsPage extends StatelessWidget {
     );
   }
 }
+
+class SectionTitle extends StatelessWidget {
+  final String text;
+
+  const SectionTitle(this.text);
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: EdgeInsets.only(left: 16, top: 6, right: 16, bottom: 12),
+      child: HighlightTitle(text),
+    );
+  }
+}
diff --git a/lib/widgets/settings/svg_background.dart b/lib/widgets/settings/svg_background.dart
index 780ec1cb7..fc2497b3d 100644
--- a/lib/widgets/settings/svg_background.dart
+++ b/lib/widgets/settings/svg_background.dart
@@ -11,33 +11,35 @@ class _SvgBackgroundSelectorState extends State<SvgBackgroundSelector> {
   @override
   Widget build(BuildContext context) {
     const radius = 24.0;
-    return DropdownButton<int>(
-      items: [0xFFFFFFFF, 0xFF000000, 0x00000000].map((selected) {
-        return DropdownMenuItem(
-          value: selected,
-          child: Container(
-            height: radius,
-            width: radius,
-            decoration: BoxDecoration(
-              color: Color(selected),
-              border: AvesCircleBorder.build(context),
-              shape: BoxShape.circle,
+    return DropdownButtonHideUnderline(
+      child: DropdownButton<int>(
+        items: [0xFFFFFFFF, 0xFF000000, 0x00000000].map((selected) {
+          return DropdownMenuItem<int>(
+            value: selected,
+            child: Container(
+              height: radius,
+              width: radius,
+              decoration: BoxDecoration(
+                color: Color(selected),
+                border: AvesCircleBorder.build(context),
+                shape: BoxShape.circle,
+              ),
+              child: selected == 0
+                  ? Icon(
+                      Icons.clear,
+                      size: 20,
+                      color: Colors.white30,
+                    )
+                  : null,
             ),
-            child: selected == 0
-                ? Icon(
-                    Icons.clear,
-                    size: 20,
-                    color: Colors.white30,
-                  )
-                : null,
-          ),
-        );
-      }).toList(),
-      value: settings.svgBackground,
-      onChanged: (selected) {
-        settings.svgBackground = selected;
-        setState(() {});
-      },
+          );
+        }).toList(),
+        value: settings.svgBackground,
+        onChanged: (selected) {
+          settings.svgBackground = selected;
+          setState(() {});
+        },
+      ),
     );
   }
 }
diff --git a/pubspec.lock b/pubspec.lock
index 10e5d7d0b..dccce0a00 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -466,6 +466,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.1.1"
+  overlay_support:
+    dependency: "direct main"
+    description:
+      name: overlay_support
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.5"
   package_config:
     dependency: transitive
     description:
diff --git a/pubspec.yaml b/pubspec.yaml
index e1ca0fab9..14a2061d3 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -63,6 +63,7 @@ dependencies:
   intl:
   latlong: # for flutter_map
   outline_material_icons:
+  overlay_support:
   package_info:
   palette_generator:
   pdf: