title: SwiftUI - Graphically reduce a VStack
body: <p>I would like to graphically reduce a View or a <code>VStack</code> like I saw in a video. The guy selects the <code>VStack</code> and by pressing on his keyboard he gets a thumbnail of his <code>VStack</code>.
  I have this :</p>
  
  <pre><code>VStack {
      TextField("Placeholder", text: $newValue)
          .background(Color.white)
      Button(action: {}) {
          Text("Button")
      }
  }.padding()
  </code></pre>
  
  <p>and I'd like to have to this:</p>
  
  <pre><code>VStack{...}.padding()
  </code></pre>
  
  <p>What are the keyboard keys to enter?</p>