title: How to create modal slide-out window in Mac OS?
body: <p>How can I create modal slide-out window/view "in-window" in Xcode like in these screenshot?</p>
  
  <p>I've tried create new Window controller with "Authentication panel style" animation but then I'm receiving only Xcode crashes.</p>
  
  <p><a href="https://i.stack.imgur.com/z61Ee.png" rel="noreferrer"><img src="https://i.stack.imgur.com/z61Ee.png" alt="modal window"></a></p>