<!--
{
  "availability" : [
    "macOS: 10.11.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "AppKit",
  "identifier" : "/documentation/AppKit/NSSplitViewItem/CollapseBehavior-swift.enum/preferResizingSiblingsWithFixedSplitView",
  "metadataVersion" : "0.1.0",
  "role" : "Case",
  "symbol" : {
    "kind" : "Case",
    "modules" : [
      "AppKit"
    ],
    "preciseIdentifier" : "c:@E@NSSplitViewItemCollapseBehavior@NSSplitViewItemCollapseBehaviorPreferResizingSiblingsWithFixedSplitView"
  },
  "title" : "NSSplitViewItem.CollapseBehavior.preferResizingSiblingsWithFixedSplitView"
}
-->

# NSSplitViewItem.CollapseBehavior.preferResizingSiblingsWithFixedSplitView

The item’s preference is to resize the other split panes.

```
case preferResizingSiblingsWithFixedSplitView
```

## Discussion

The split view item breaks this preference if it can’t fully expand without causing the other split panes to resize below their minimum size threshold.

---

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)