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# principal

A placement for the principal item section.

```
static let principal: ToolbarItemPlacement
```

## Discussion

Principal actions are key units of functionality that receive prominent
placement. For example, the location field for a web browser is a
principal item.

In macOS and in Mac Catalyst apps, the system places the principal item
in the center of the toolbar.

In iOS, iPadOS, and tvOS, the system places the principal item in the
center of the navigation bar. This item takes precedent over a title
specified through `View/navigationTitle`.

---

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