How to rotate a SwiftUI view?

I just tried out the app "Blue Moon" (Solitaire Game) from the App Store. They managed to add a secondary SwiftUI tutorial view that resides to the left of the main window and is rotated towards the user. How can this be achieved? I tried to use ornaments, but couldn't find a tilting / rotating option.

How to rotate a SwiftUI view?
 
 
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