---
title: allowsFullHeightLayout
framework: appkit
role: symbol
role_heading: Instance Property
path: appkit/nssplitviewitem/allowsfullheightlayout
---

# allowsFullHeightLayout

A Boolean value that indicates whether full-height sidebars appear in the window after you set a style mask.

## Declaration

```swift
var allowsFullHeightLayout: Bool { get set }
```

## Discussion

Discussion This property only applies to NSSplitViewItem.Behavior.sidebar and NSSplitViewItem.Behavior.inspector. The default value is true.

## See Also

### Customizing appearance

- [titlebarSeparatorStyle](appkit/nssplitviewitem/titlebarseparatorstyle.md)
- [NSTitlebarSeparatorStyle](appkit/nstitlebarseparatorstyle.md)