title: Adding double-sided arrows on line in diagram
body: <p>I want to do transition diagram between screens and I need both side arrows like this:<a href="https://i.stack.imgur.com/4OCN2.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/4OCN2.png" alt="enter image description here"></a>
  Can anyone knows where I can find this option in Enterprise Architect?
  Thanks in advance.</p>