# collapsedChanged

> Invoked when Overlay.collapsed value is changed.

## Definition

* **Type:** Event
* **Namespace:** [UnityEditor.Overlays](/engine/6000.3/script-reference/unityeditor/overlays.md)
* **Assembly:** UnityEditor

```csharp
public event Action<bool> collapsedChanged
```

### Remarks

Value is true when [Overlay](/engine/6000.3/script-reference/unityeditor/overlays/overlay.md) is entering a collapsed state, false when exiting.