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# callAsFunction()

Opens the window associated to the [`Settings`](/documentation/SwiftUI/Settings) scene defined by this
app, if one exists.

```
@MainActor @preconcurrency func callAsFunction()
```

## Discussion

Calling this action when the window is already open will order it to
the front.

Don’t call this method directly. SwiftUI calls it when you
call the [`openSettings`](/documentation/SwiftUI/EnvironmentValues/openSettings) action:

```
openSettings()
```

For information about how Swift uses the `callAsFunction()` method to
simplify call site syntax, see
[Methods with Special Names](https://docs.swift.org/swift-book/ReferenceManual/Declarations.html#ID622)
in *The Swift Programming Language*.

---

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