# optional

> Indicates whether the column is optional. Optional columns be shown or hidden interactively by the user.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine.UIElements](/engine/6000.7/script-reference/unityengine/uielements.md)
* **Assembly:** UnityEngine.UIElementsModule

```csharp
[UxmlAttribute]
public bool optional { get; set; }
```