# arraySizeFieldWithHeaderUssClassName

> The USS class name for the size field of the ListView when foldout header is enabled.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine.UIElements](/engine/6000.5/script-reference/unityengine/uielements.md)
* **Assembly:** UnityEngine.UIElementsModule

```csharp
public static readonly string arraySizeFieldWithHeaderUssClassName
```

### Remarks

Unity adds this USS class to the size field element in the ListView when [\_showBoundCollectionSize](/engine/6000.5/script-reference/unityengine/uielements/baselistview/showboundcollectionsize.md) is set to `true`. Any styling applied to this class affects every size field located beside, or below the stylesheet in the visual tree.