diff --git a/Checks/system-playback.swift b/Checks/system-playback.swift
index ff9a1ff..b83a929 100644
--- a/Checks/system-playback.swift
+++ b/Checks/system-playback.swift
@@ -140,6 +140,15 @@ struct SystemPlaybackChecks {
         window.isReleasedWhenClosed = false
         defer { window.close() }
         model.attachWindow(window)
+        let videoFrame = window.frame
+        model.showsQueue = true
+        require(abs(window.frame.width - videoFrame.width - 261) < 0.01 &&
+                abs(window.frame.height - videoFrame.height) < 0.01,
+                "opening queue grows window without shrinking video")
+        model.showsQueue = false
+        require(abs(window.frame.width - videoFrame.width) < 0.01 &&
+                abs(window.frame.height - videoFrame.height) < 0.01,
+                "closing queue restores video-only window size")
         model.open(directory.appendingPathComponent("anamorphic.mp4"))
         require(model.isBusy && model.perform(.enterCompact) && model.isCompact,
                 "compact entry is available before native media opening acknowledges")
diff --git a/README.md b/README.md
index 6e017cb..aa8c219 100644
--- a/README.md
+++ b/README.md
@@ -57,6 +57,8 @@ Active playback prevents idle system sleep. Local video also keeps the display a
 
 Use the titlebar's **Queue** icon or **View → Show Queue** to show the editable sidebar. **Add to Queue…** and dropping files onto the sidebar append without replacing the queue or interrupting the current item. Drag rows to reorder, remove them with the minus button, and double-click a row to play it. The current item is marked; context menus also offer Play, Remove and Move Up/Down.
 
+In a normal window, showing the queue expands the window outward while preserving the video's size; hiding it removes that extra width. The window shifts left when necessary near the screen's right edge. Fullscreen keeps its fixed bounds.
+
 Playback advances automatically and stops at the end, without wrapping. **Previous Queue Item** and **Next Queue Item** are available in the sidebar and Playback menu and are disabled at their respective ends. Reordering or removing another item does not interrupt playback; removing the current item plays its next neighbor, or stops if there is none. A playback error stays on that item rather than skipping it.
 
 The queue contains local files only and lasts until it is replaced, closed or the app quits; it has no persistence, shuffle, repeat or playlist-file import. Opening a YouTube video or resolved stream clears it. The sidebar is hidden in compact mode; Playback-menu queue navigation remains available. Sidebar appearance, drag/drop interaction and physical-receiver queue transitions still need manual verification.
diff --git a/Sources/App/TerebiApp.swift b/Sources/App/TerebiApp.swift
index 2f479f6..0473c4b 100644
--- a/Sources/App/TerebiApp.swift
+++ b/Sources/App/TerebiApp.swift
@@ -32,7 +32,22 @@ final class PlayerModel: ObservableObject {
     @Published private(set) var fileIcon: NSImage?
     @Published private(set) var commandError: String?
     @Published private(set) var queue = PlaybackQueue()
-    @Published var showsQueue = false
+    @Published var showsQueue = false {
+        didSet {
+            guard showsQueue != oldValue, let window, !isFullScreen,
+                  !isCompact, !compactWindow.isTransitioning else { return }
+            window.aspectRatio = .zero
+            var frame = window.frame
+            frame.size.width += showsQueue ? 261 : -261
+            if let screen = window.screen?.visibleFrame {
+                frame.origin.x = max(screen.minX, min(frame.minX, screen.maxX - frame.width))
+            }
+            window.setFrame(frame, display: true)
+            if !showsQueue, state.has_video, state.video_aspect_ratio > 0 {
+                window.aspectRatio = NSSize(width: state.video_aspect_ratio, height: 1)
+            }
+        }
+    }
     private var queuePlaybackRevision: UInt64?
     private var queueCompletionHandled = false
     private var queueCastDevice: CastDevice?
@@ -968,14 +983,15 @@ final class PlayerModel: ObservableObject {
             return
         }
         let screen = (window.screen ?? NSScreen.main)?.visibleFrame ?? window.frame
-        let width = min(window.frame.width, screen.width, screen.height * aspect)
-        let size = NSSize(width: width, height: width / aspect)
+        let sidebarWidth: CGFloat = showsQueue ? 261 : 0
+        let width = min(window.frame.width - sidebarWidth, screen.width - sidebarWidth, screen.height * aspect)
+        let size = NSSize(width: width + sidebarWidth, height: width / aspect)
         // ponytail: extreme ratios retain letterboxing; compact controls if exact fitting is needed.
         guard size.width >= window.minSize.width, size.height >= window.minSize.height else {
             window.aspectRatio = .zero
             return
         }
-        window.aspectRatio = NSSize(width: aspect, height: 1)
+        window.aspectRatio = showsQueue ? .zero : NSSize(width: aspect, height: 1)
         let frame = NSRect(
             x: min(max(window.frame.midX - size.width / 2, screen.minX), screen.maxX - size.width),
             y: min(max(window.frame.midY - size.height / 2, screen.minY), screen.maxY - size.height),