---
title: transient
framework: appkit
role: symbol
role_heading: Type Property
path: appkit/nswindow/collectionbehavior-swift.struct/transient
---

# transient

The window floats in Spaces and hides in Mission Control.

## Declaration

```swift
static var transient: NSWindow.CollectionBehavior { get }
```

## Discussion

Discussion This is the default behavior if windowLevel isn’t equal to normal.

## See Also

### Spaces and Mission Control

- [managed](appkit/nswindow/collectionbehavior-swift.struct/managed.md)