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# minimumThickness

The minimum thickness of the split view item.

```
var minimumThickness: CGFloat { get set }
```

## Discussion

This value affects the split view item’s width (for a vertical split view) or height (for a horizontal split view).

The default value of this property is [`unspecifiedDimension`](/documentation/AppKit/NSSplitViewItem/unspecifiedDimension), which means the split view item doesn’t enforce a minimum size. However, layout constraints in the contained view hierarchy might specify a minimum size regardless.

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