title: How to change the size and position of popover's page in swiftUI?
body: <p>I want to set the position and size of Popover page.</p>
  
  <p>I tried all parameters of  func popover, I think it may be related with attachmentAnchor and arrowEdge.</p>
  
  <p>Here is my code:</p>
  
  <pre><code>    import SwiftUI
  
      struct ContentView : View {
          @State var isPop = false
  
          var body: some View {
  
              VStack{
                  Button("Pop", action: {self.isPop = true})
                      .popover(isPresented: $isPop,  attachmentAnchor: .point(UnitPoint(x: 20, y: 20)), arrowEdge: .top, content: {return Rectangle().frame(height: 100).foregroundColor(Color.blue)})
              }
  
          }
  
      }
  </code></pre>
  
  <p>The effect I want:</p>
  
  <p><a href="https://i.stack.imgur.com/oZUYy.png" rel="noreferrer"><img src="https://i.stack.imgur.com/oZUYy.png" alt="Image"></a></p>