title: macOS Big Sur new toolbar button style
body: <p>When I create an App with SwiftUI App Lifecycle the toolbar buttons match with the new Big Sur toolbar button style (with onHover effect style). But if I choose the conventional AppDelegate Lifecycle and customize the toolbar via Storyboards then I get this button style without onHover effect:</p>
  <p><a href="https://i.stack.imgur.com/KAFac.png" rel="noreferrer"><img src="https://i.stack.imgur.com/KAFac.png" alt="enter image description here" /></a></p>
  <p>The button appears with a rectangle as background. Does anyone know how could I achieve the new style?</p>