diff --git a/Memola.xcodeproj/project.pbxproj b/Memola.xcodeproj/project.pbxproj
index f442273..7f19d8e 100644
--- a/Memola.xcodeproj/project.pbxproj
+++ b/Memola.xcodeproj/project.pbxproj
@@ -47,6 +47,7 @@
 		EC6E3BD72C43C6A400DD20F3 /* Application.swift in Sources */ = {isa = PBXBuildFile; fileRef = EC6E3BD62C43C6A400DD20F3 /* Application.swift */; };
 		EC6E3BD92C43C6C000DD20F3 /* OnDismissSearchViewModifier.swift in Sources */ = {isa = PBXBuildFile; fileRef = EC6E3BD82C43C6C000DD20F3 /* OnDismissSearchViewModifier.swift */; };
 		EC6E3BDB2C43C78700DD20F3 /* NavigationSplitViewVisibility++.swift in Sources */ = {isa = PBXBuildFile; fileRef = EC6E3BDA2C43C78700DD20F3 /* NavigationSplitViewVisibility++.swift */; };
+		EC6E3BDE2C43D5A500DD20F3 /* SidebarVisibility.swift in Sources */ = {isa = PBXBuildFile; fileRef = EC6E3BDC2C43D5A500DD20F3 /* SidebarVisibility.swift */; };
 		EC7F6BEC2BE5E6E300A34A7B /* MemolaApp.swift in Sources */ = {isa = PBXBuildFile; fileRef = EC7F6BEB2BE5E6E300A34A7B /* MemolaApp.swift */; };
 		EC7F6BF02BE5E6E400A34A7B /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = EC7F6BEF2BE5E6E400A34A7B /* Assets.xcassets */; };
 		EC7F6BF32BE5E6E400A34A7B /* Preview Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = EC7F6BF22BE5E6E400A34A7B /* Preview Assets.xcassets */; };
@@ -185,6 +186,7 @@
 		EC6E3BD62C43C6A400DD20F3 /* Application.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Application.swift; sourceTree = "<group>"; };
 		EC6E3BD82C43C6C000DD20F3 /* OnDismissSearchViewModifier.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = OnDismissSearchViewModifier.swift; sourceTree = "<group>"; };
 		EC6E3BDA2C43C78700DD20F3 /* NavigationSplitViewVisibility++.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "NavigationSplitViewVisibility++.swift"; sourceTree = "<group>"; };
+		EC6E3BDC2C43D5A500DD20F3 /* SidebarVisibility.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SidebarVisibility.swift; sourceTree = "<group>"; };
 		EC7F6BE82BE5E6E300A34A7B /* Memola.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Memola.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		EC7F6BEB2BE5E6E300A34A7B /* MemolaApp.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MemolaApp.swift; sourceTree = "<group>"; };
 		EC7F6BEF2BE5E6E400A34A7B /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
@@ -519,6 +521,14 @@
 			path = Algorithms;
 			sourceTree = "<group>";
 		};
+		EC6E3BDD2C43D5A500DD20F3 /* SidebarVisibility */ = {
+			isa = PBXGroup;
+			children = (
+				EC6E3BDC2C43D5A500DD20F3 /* SidebarVisibility.swift */,
+			);
+			path = SidebarVisibility;
+			sourceTree = "<group>";
+		};
 		EC7F6BDF2BE5E6E300A34A7B = {
 			isa = PBXGroup;
 			children = (
@@ -989,6 +999,7 @@
 		ECF7B2E52C391DFA004D2C57 /* Utilies */ = {
 			isa = PBXGroup;
 			children = (
+				EC6E3BDD2C43D5A500DD20F3 /* SidebarVisibility */,
 				EC2002EE2C417BBF002EBD5F /* AppScene */,
 				ECF7B2CF2C39169C004D2C57 /* Extensions */,
 				ECF7B2E22C39172D004D2C57 /* Platform */,
@@ -1133,6 +1144,7 @@
 				ECA738DA2BE60FF100A4542E /* CacheRenderPass.swift in Sources */,
 				ECF7B2DA2C39169C004D2C57 /* Float++.swift in Sources */,
 				ECA738CD2BE60F2F00A4542E /* PointGridContext.swift in Sources */,
+				EC6E3BDE2C43D5A500DD20F3 /* SidebarVisibility.swift in Sources */,
 				ECFA15202BEF21EF00455818 /* MemoObject.swift in Sources */,
 				ECE883C12C00C9CB0045C53D /* StrokeStyle.swift in Sources */,
 				EC37FB122C1B2DD90008D976 /* ToolSelection.swift in Sources */,
diff --git a/Memola/App/Application.swift b/Memola/App/Application.swift
index fd9972f..acbbaf5 100644
--- a/Memola/App/Application.swift
+++ b/Memola/App/Application.swift
@@ -9,7 +9,7 @@ import Combine
 import SwiftUI
 
 final class Application: NSObject, ObservableObject {
-    
+    @Published private(set) var sidebarVisibility: SidebarVisibility = .shown
 }
 
 extension Application {
@@ -23,6 +23,18 @@ extension Application {
         #warning("TODO: implement for ipad")
         #endif
     }
+
+    func toggleSidebar() {
+        #if os(macOS)
+        NSApp.sendAction(#selector(NSSplitViewController.toggleSidebar(_:)), to: nil, from: nil)
+        #else
+        #warning("TODO: implement for ipad")
+        #endif
+    }
+
+    func changeSidebarVisibility(_ visibility: SidebarVisibility) {
+        self.sidebarVisibility = visibility
+    }
 }
 
 #if os(macOS)
diff --git a/Memola/Canvas/Tool/Core/Tool.swift b/Memola/Canvas/Tool/Core/Tool.swift
index 244f3dc..f7911c2 100644
--- a/Memola/Canvas/Tool/Core/Tool.swift
+++ b/Memola/Canvas/Tool/Core/Tool.swift
@@ -11,7 +11,7 @@ import CoreData
 import Foundation
 
 final class Tool: NSObject, ObservableObject {
-    private let object: ToolObject
+    let object: ToolObject
 
     @Published var pens: [Pen] = []
 
diff --git a/Memola/Features/Dashboard/Dashboard/DashboardView.swift b/Memola/Features/Dashboard/Dashboard/DashboardView.swift
index bfccddf..05a0ece 100644
--- a/Memola/Features/Dashboard/Dashboard/DashboardView.swift
+++ b/Memola/Features/Dashboard/Dashboard/DashboardView.swift
@@ -11,6 +11,7 @@ struct DashboardView: View {
     @Environment(\.horizontalSizeClass) private var horizontalSizeClass
 
     @StateObject private var memoManager: MemoManager = .shared
+    @EnvironmentObject private var application: Application
 
     @State private var sidebarItem: SidebarItem? = .memos
     @AppStorage("memola.app.scene.side-bar.column-visibility") private var columnVisibility: NavigationSplitViewVisibility = .all
@@ -45,6 +46,9 @@ struct DashboardView: View {
                     .transition(.move(edge: .bottom))
             }
         }
+        .onChange(of: columnVisibility) { oldValue, newValue in
+            application.changeSidebarVisibility(newValue == .all ? .shown : .hidden)
+        }
         #else
         NavigationSplitView(columnVisibility: $columnVisibility) {
             Sidebar(sidebarItem: $sidebarItem, horizontalSizeClass: horizontalSizeClass)
diff --git a/Memola/Shortcut/Commands/ViewCommands.swift b/Memola/Shortcut/Commands/ViewCommands.swift
index 2a0fecc..beb2bc0 100644
--- a/Memola/Shortcut/Commands/ViewCommands.swift
+++ b/Memola/Shortcut/Commands/ViewCommands.swift
@@ -17,7 +17,7 @@ struct ViewCommands: Commands {
 
     var body: some Commands {
         CommandGroup(replacing: .toolbar) {
-            if appScene == .trash || appScene == .memos {
+            if appScene == .memos || appScene == .trash {
                 Button {
                     application.activateSearchBar()
                 } label: {
@@ -25,6 +25,19 @@ struct ViewCommands: Commands {
                 }
                 .keyboardShortcut("f", modifiers: [.command])
             }
+            if appScene == .memos || appScene == .trash {
+                Button {
+                    application.toggleSidebar()
+                } label: {
+                    switch application.sidebarVisibility {
+                    case .shown:
+                        Text("Hide Sidebar")
+                    case .hidden:
+                        Text("Show Sidebar")
+                    }
+                }
+                .keyboardShortcut("o", modifiers: [.command])
+            }
         }
     }
 }