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# customizationAllowedItemIdentifiers

A list of identifiers for items to show in the Touch Bar’s customization UI.

```
var customizationAllowedItemIdentifiers: [NSTouchBarItem.Identifier] { get set }
```

## Discussion

The customization UI shows these items in additional to the items in [`defaultItemIdentifiers`](/documentation/AppKit/NSTouchBar/defaultItemIdentifiers).

The items you include in [`customizationAllowedItemIdentifiers`](/documentation/AppKit/NSTouchBar/customizationAllowedItemIdentifiers) appear individually in the customization UI, arranged in the same order as you specify in the array. As long as there’s available geometric space, a user can drag in to the associated bar any of the items in this list.

Always configure this property for a customizable bar.

The system archives this property.

## See Also

[`defaultItemIdentifiers`](/documentation/AppKit/NSTouchBar/defaultItemIdentifiers)

A required list of identifiers for items that you want to appear in the Touch Bar after instantiating it.

[`itemIdentifiers`](/documentation/AppKit/NSTouchBar/itemIdentifiers)

The list of identifiers for the current items in the Touch Bar.


---

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