diff --git a/Documentation/Reference/structs/OverlaySplitView.md b/Documentation/Reference/structs/OverlaySplitView.md
index 210096b..2208670 100644
--- a/Documentation/Reference/structs/OverlaySplitView.md
+++ b/Documentation/Reference/structs/OverlaySplitView.md
@@ -17,6 +17,10 @@ The split view's main content.
 
 Whether the sidebar is at the trailing position.
 
+### `visible`
+
+Whether the sidebar is visible.
+
 ### `sidebarID`
 
 The sidebar content's id.
@@ -26,10 +30,11 @@ The sidebar content's id.
 The main content's id.
 
 ## Methods
-### `init(sidebar:content:)`
+### `init(visible:sidebar:content:)`
 
 Initialize an overlay split view.
 - Parameters:
+  - visible: Whether the sidebar is visible.
   - sidebar: The sidebar content.
   - content: The main content.
 
@@ -55,3 +60,4 @@ Update the view storage of the overlay split view widget.
 ### `updatePosition(_:)`
 
 Update the sidebar's position in the split view.
+- Parameter splitView: The overlay split view.
diff --git a/Icons/Demo.png b/Icons/Demo.png
index b3f1a90..e7c9bd4 100644
Binary files a/Icons/Demo.png and b/Icons/Demo.png differ
diff --git a/Sources/Adwaita/View/OverlaySplitView.swift b/Sources/Adwaita/View/OverlaySplitView.swift
index b4d0308..678eda0 100644
--- a/Sources/Adwaita/View/OverlaySplitView.swift
+++ b/Sources/Adwaita/View/OverlaySplitView.swift
@@ -16,6 +16,8 @@ public struct OverlaySplitView: Widget {
     var content: () -> Body
     /// Whether the sidebar is at the trailing position.
     var trailing = false
+    /// Whether the sidebar is visible.
+    var visible: Bool
 
     /// The sidebar content's id.
     let sidebarID = "sidebar"
@@ -24,11 +26,17 @@ public struct OverlaySplitView: Widget {
 
     /// Initialize an overlay split view.
     /// - Parameters:
+    ///   - visible: Whether the sidebar is visible.
     ///   - sidebar: The sidebar content.
     ///   - content: The main content.
-    public init(@ViewBuilder sidebar: @escaping () -> Body, @ViewBuilder content: @escaping () -> Body) {
+    public init(
+        visible: Bool = true,
+        @ViewBuilder sidebar: @escaping () -> Body,
+        @ViewBuilder content: @escaping () -> Body
+    ) {
         self.sidebar = sidebar
         self.content = content
+        self.visible = visible
     }
 
     /// The position of the sidebar.
@@ -77,8 +85,14 @@ public struct OverlaySplitView: Widget {
     }
 
     /// Update the sidebar's position in the split view.
+    /// - Parameter splitView: The overlay split view.
     func updatePosition(_ splitView: Libadwaita.OverlaySplitView) {
         _ = splitView.position(trailing: trailing)
+        if visible {
+            splitView.showSidebar()
+        } else {
+            splitView.hideSidebar()
+        }
     }
 
 }
diff --git a/Sources/Adwaita/View/Toggle.swift b/Sources/Adwaita/View/Toggle.swift
index ac7571e..7713bbd 100644
--- a/Sources/Adwaita/View/Toggle.swift
+++ b/Sources/Adwaita/View/Toggle.swift
@@ -55,6 +55,9 @@ public struct Toggle: Widget {
     public func container(modifiers: [(View) -> View]) -> ViewStorage {
         let toggle: Libadwaita.ToggleButton = .init(label ?? "")
         updateState(toggle: toggle)
+        toggle.handler {
+            self.isOn.toggle()
+        }
         return .init(toggle)
     }
 
diff --git a/Tests/Demo.swift b/Tests/Demo.swift
index 57958c0..1e0de86 100644
--- a/Tests/Demo.swift
+++ b/Tests/Demo.swift
@@ -57,11 +57,12 @@ struct Demo: App {
 
         @State private var selection: Page = .welcome
         @State private var toast: Signal = .init()
+        @State private var sidebarVisible = true
         var window: GTUIApplicationWindow
         var app: GTUIApp!
 
         var view: Body {
-            NavigationSplitView {
+            OverlaySplitView(visible: sidebarVisible) {
                 ScrollView {
                     List(Page.allCases, selection: $selection) { element in
                         Text(element.label)
@@ -72,21 +73,7 @@ struct Demo: App {
                 }
                 .topToolbar {
                     HeaderBar.end {
-                        Menu(icon: .default(icon: .openMenu), app: app, window: window) {
-                            MenuButton("New Window", window: false) {
-                                app.addWindow("main")
-                            }
-                            .keyboardShortcut("n".ctrl())
-                            MenuButton("Close Window") {
-                                window.close()
-                            }
-                            .keyboardShortcut("w".ctrl())
-                            MenuSection {
-                                MenuButton("About") { app.addWindow("about", parent: window) }
-                                MenuButton("Quit", window: false) { app.quit() }
-                                    .keyboardShortcut("q".ctrl())
-                            }
-                        }
+                        menu
                     }
                 }
                 .navigationTitle("Demo")
@@ -95,16 +82,52 @@ struct Demo: App {
                     selection.label,
                     icon: selection.icon,
                     description: selection.description
-                ) {
-                    selection.view(app: app, window: window, toast: toast)
-                }
+                ) { selection.view(app: app, window: window, toast: toast) }
                 .topToolbar {
-                    HeaderBar.empty()
+                    HeaderBar {
+                        Toggle(icon: .default(icon: .sidebarShow), isOn: $sidebarVisible)
+                    } end: {
+                        if sidebarVisible {
+                            Text("")
+                                .transition(.crossfade)
+                        } else {
+                            menu
+                                .transition(.crossfade)
+                        }
+                    }
+                    .headerBarTitle {
+                        if sidebarVisible {
+                            Text("")
+                                .transition(.crossfade)
+                        } else {
+                            Text("Swift Adwaita Demo")
+                                .style("heading")
+                                .transition(.crossfade)
+                        }
+                    }
                 }
                 .toast("This is a toast!", signal: toast)
             }
         }
 
+        var menu: View {
+            Menu(icon: .default(icon: .openMenu), app: app, window: window) {
+                MenuButton("New Window", window: false) {
+                    app.addWindow("main")
+                }
+                .keyboardShortcut("n".ctrl())
+                MenuButton("Close Window") {
+                    window.close()
+                }
+                .keyboardShortcut("w".ctrl())
+                MenuSection {
+                    MenuButton("About") { app.addWindow("about", parent: window) }
+                    MenuButton("Quit", window: false) { app.quit() }
+                        .keyboardShortcut("q".ctrl())
+                }
+            }
+        }
+
     }
 
 }