Feature: Display banner when all sections are hidden on the sidebar

src/Files.App.Controls/Sidebar/SidebarView.Properties.cs

@@ -21,6 +21,14 @@ public UIElement InnerContent
 		public static readonly DependencyProperty InnerContentProperty =
 			DependencyProperty.Register(nameof(InnerContent), typeof(UIElement), typeof(SidebarView), new PropertyMetadata(null));
 
+		public UIElement SidebarContent
+		{
+			get { return (UIElement)GetValue(SidebarContentProperty); }
+			set { SetValue(SidebarContentProperty, value); }
+		}
+		public static readonly DependencyProperty SidebarContentProperty =
+			DependencyProperty.Register("SidebarContent", typeof(UIElement), typeof(SidebarView), new PropertyMetadata(null));
+
 		public UIElement Footer
 		{
 			get { return (UIElement)GetValue(FooterProperty); }

src/Files.App.Controls/Sidebar/SidebarView.xaml

@@ -57,6 +57,15 @@
 				<CompositeTransform x:Name="PaneColumnGridTransform" />
 			</Grid.RenderTransform>
 
+			<!--  Content  -->
+			<ContentPresenter
+				Grid.RowSpan="2"
+				HorizontalAlignment="Stretch"
+				VerticalAlignment="Stretch"
+				HorizontalContentAlignment="Stretch"
+				VerticalContentAlignment="Stretch"
+				Content="{x:Bind SidebarContent, Mode=OneWay}" />
+
 			<!--  Menu Items  -->
 			<ItemsRepeaterScrollHost HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
 				<ScrollViewer

src/Files.App/Strings/en-US/Resources.resw

@@ -3508,7 +3508,7 @@
   <data name="StatusCenter_GitCloneInProgress_SubHeader" xml:space="preserve">
     <value>Cloning {0} from "{1}" to "{2}"</value>
     <comment>Shown in a StatusCenter card.</comment>
-  </data>	
+  </data>
   <data name="StatusCenter_InstallFontCanceled_Header" xml:space="preserve">
     <value>Canceled installing {0} fonts</value>
     <comment>Shown in a StatusCenter card.</comment>
@@ -3540,7 +3540,7 @@
   <data name="StatusCenter_InstallFontInProgress_SubHeader" xml:space="preserve">
     <value>Installing {0} font(s) from "{1}"</value>
     <comment>Shown in a StatusCenter card.</comment>
-  </data>	
+  </data>
   <data name="StatusCenter_CopyCanceled_Header" xml:space="preserve">
     <value>Canceled copying {0} item(s) to "{1}"</value>
     <comment>Shown in a StatusCenter card.</comment>
@@ -4193,4 +4193,7 @@
   <data name="EnableOmnibar" xml:space="preserve">
     <value>Enable Omnibar</value>
   </data>
+  <data name="SectionsHiddenMessage" xml:space="preserve">
+    <value>You can add sections to the sidebar by right-clicking and selecting the sections you want to add.</value>
+  </data>
 </root>

src/Files.App/ViewModels/UserControls/SidebarViewModel.cs

@@ -59,6 +59,7 @@ public SidebarDisplayMode SidebarDisplayMode
 				if (SetProperty(ref sidebarDisplayMode, value))
 				{
 					OnPropertyChanged(nameof(IsSidebarCompactSize));
+					OnPropertyChanged(nameof(AreSectionsHidden));
 					IsSidebarOpen = sidebarDisplayMode == SidebarDisplayMode.Expanded;
 					UpdateTabControlMargin();
 				}
@@ -134,6 +135,16 @@ public bool IsSidebarOpen
 			}
 		}
 
+		public bool AreSectionsHidden =>
+			!ShowPinnedFoldersSection &&
+			!ShowLibrarySection &&
+			!ShowDrivesSection &&
+			!ShowCloudDrivesSection &&
+			!ShowNetworkSection &&
+			(!ShowWslSection || WSLDistroManager.Distros.Any() == false) &&
+			!ShowFileTagsSection &&
+			SidebarDisplayMode is not SidebarDisplayMode.Compact;
+
 		public bool ShowPinnedFoldersSection
 		{
 			get => UserSettingsService.GeneralSettingsService.ShowPinnedSection;
@@ -635,30 +646,37 @@ private async void UserSettingsService_OnSettingChangedEvent(object sender, Sett
 				case nameof(UserSettingsService.GeneralSettingsService.ShowPinnedSection):
 					await UpdateSectionVisibilityAsync(SectionType.Pinned, ShowPinnedFoldersSection);
 					OnPropertyChanged(nameof(ShowPinnedFoldersSection));
+					OnPropertyChanged(nameof(AreSectionsHidden));
 					break;
 				case nameof(UserSettingsService.GeneralSettingsService.ShowLibrarySection):
 					await UpdateSectionVisibilityAsync(SectionType.Library, ShowLibrarySection);
 					OnPropertyChanged(nameof(ShowLibrarySection));
+					OnPropertyChanged(nameof(AreSectionsHidden));
 					break;
 				case nameof(UserSettingsService.GeneralSettingsService.ShowCloudDrivesSection):
 					await UpdateSectionVisibilityAsync(SectionType.CloudDrives, ShowCloudDrivesSection);
 					OnPropertyChanged(nameof(ShowCloudDrivesSection));
+					OnPropertyChanged(nameof(AreSectionsHidden));
 					break;
 				case nameof(UserSettingsService.GeneralSettingsService.ShowDrivesSection):
 					await UpdateSectionVisibilityAsync(SectionType.Drives, ShowDrivesSection);
 					OnPropertyChanged(nameof(ShowDrivesSection));
+					OnPropertyChanged(nameof(AreSectionsHidden));
 					break;
 				case nameof(UserSettingsService.GeneralSettingsService.ShowNetworkSection):
 					await UpdateSectionVisibilityAsync(SectionType.Network, ShowNetworkSection);
 					OnPropertyChanged(nameof(ShowNetworkSection));
+					OnPropertyChanged(nameof(AreSectionsHidden));
 					break;
 				case nameof(UserSettingsService.GeneralSettingsService.ShowWslSection):
 					await UpdateSectionVisibilityAsync(SectionType.WSL, ShowWslSection);
 					OnPropertyChanged(nameof(ShowWslSection));
+					OnPropertyChanged(nameof(AreSectionsHidden));
 					break;
 				case nameof(UserSettingsService.GeneralSettingsService.ShowFileTagsSection):
 					await UpdateSectionVisibilityAsync(SectionType.FileTag, ShowFileTagsSection);
 					OnPropertyChanged(nameof(ShowFileTagsSection));
+					OnPropertyChanged(nameof(AreSectionsHidden));
 					break;
 			}
 		}