title: SwiftUI NavigationView on the iPad Pro
body: <p>I use the Apple SwiftUI tutorial code. Then I set the previewDevice to iPad Pro (12.9-inch). But the preview has something wrong.
  Does anyone know where the problem is?</p>
  
  <p><a href="https://i.stack.imgur.com/NQdho.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/NQdho.jpg" alt="SwiftUI preview issue"></a></p>