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# creatingOptionalGroup(customizationIdentifier:isInDefaultCustomization:)

Places the item in an optional group that a person can move, add to, or remove from the navigation bar during layout customization.

```
@MainActor @preconcurrency func creatingOptionalGroup(customizationIdentifier: String, isInDefaultCustomization: Bool = true) -> UIBarButtonItemGroup
```

## Parameters

`customizationIdentifier`

A unique string to identify the group for navigation bar layout customization.

`isInDefaultCustomization`

A Boolean that determines whether to place the group in the navigation bar by default. Specify <doc://com.apple.documentation/documentation/Swift/false> if you want the group to appear in the navigation bar customization popover by default.

## Return Value

A [`UIBarButtonItemGroup`](/documentation/UIKit/UIBarButtonItemGroup) that contains only this bar button item.

## Discussion

A bar button item can only belong to one [`UIBarButtonItemGroup`](/documentation/UIKit/UIBarButtonItemGroup). If you add a bar button item to a new group, the system removes it from its previous group.

---

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