Can force to use mobile mode

lib/ui/routes/settings/application_settings.dart

@@ -11,12 +11,10 @@ import 'package:settings_ui/settings_ui.dart';
 
 class ApplicationSettings extends StatefulWidget {
   @override
-  _ApplicationSettingsState createState() =>
-      _ApplicationSettingsState();
+  _ApplicationSettingsState createState() => _ApplicationSettingsState();
 }
 
-class _ApplicationSettingsState
-    extends State<ApplicationSettings> {
+class _ApplicationSettingsState extends State<ApplicationSettings> {
   PreferencesHelper _preferencesHelper;
 
   Future<void> _refresh() async {
@@ -31,7 +29,11 @@ class _ApplicationSettingsState
 
   Widget _buildSections() {
     return SettingsList(
-      sections: [_buildAppearanceSection(), _buildGeneralSection()],
+      sections: [
+        _buildAppearanceSection(),
+        _buildGeneralSection(),
+        _buildDebugSection()
+      ],
     );
   }
 
@@ -61,6 +63,21 @@ class _ApplicationSettingsState
         ],
       );
 
+  /// Debug section
+  SettingsSection _buildDebugSection() => SettingsSection(
+        title: tr("Debug features"),
+        tiles: [
+          _PreferencesSettingsTile(
+            preferencesKey: PreferencesKeyList.FORCE_MOBILE_MODE,
+            title: tr("Force mobile mode"),
+            subtitle: tr(
+                "Force the smartphone mode of the application to be used, even when tablet mode could be used."),
+            onChange: _updatedSettings,
+            helper: _preferencesHelper,
+          ),
+        ],
+      );
+
   /// Apply new settings
   _updatedSettings() {
     setState(() {});