title: How to properly show a popover?
body: <p>So I've linked one button (the one which represent a trash, in blue) with a second scene on my project as shown in the following link: <a href="https://gyazo.com/52f140f12cd5d80dd7e4ea191e8daa5f" rel="nofollow noreferrer">https://gyazo.com/52f140f12cd5d80dd7e4ea191e8daa5f</a></p>
  
  <p><strong>My problem:</strong>
  I don't know why, but my popover does not fully appear, see this picture:<a href="https://i.stack.imgur.com/0DJbS.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0DJbS.png" alt="The popover is cut"></a></p>
  
  <p><strong>My question:</strong>
  Knowing that i'm actually working with the interface builder, how can i manage this popover so it will be fully displayed (it actual size are normally set as 500*500)?
  Or do I have to do it programmatically? If yes, can someone give me a hint?</p>
  
  <p>Thanks in advance!</p>