<!--
{
  "availability" : [
    "macOS: 10.7.0 - 10.13.0"
  ],
  "documentType" : "symbol",
  "framework" : "AppKit",
  "identifier" : "/documentation/AppKit/NSToolbar/fullScreenAccessoryView",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "AppKit"
    ],
    "preciseIdentifier" : "c:objc(cs)NSToolbar(py)fullScreenAccessoryView"
  },
  "title" : "fullScreenAccessoryView"
}
-->

# fullScreenAccessoryView

The toolbar’s full screen accessory view.

```
var fullScreenAccessoryView: NSView? { get set }
```

## Discussion

When entering full screen mode, the accessory view is removed from the window if necessary, and attaches underneath the toolbar.

When leaving full screen mode, the accessory view is returned to the window, if it was in the window previously.

To customize this behavior, you can implement the [`NSWindow`](/documentation/AppKit/NSWindow) delegate method [`windowWillExitFullScreen(_:)`](/documentation/AppKit/NSWindowDelegate/windowWillExitFullScreen(_:)).

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)