title: How do I enable the rulers on Layout Editor?
body: <p>I've seen some Layout Editors in Android Studio with a ruler on top and on the side for the Preview window and I'm trying to figure it out how to enable, any ideas? I'm using Android Studio 3.0.1 and I can't see them. </p>
  
  <p><a href="https://i.stack.imgur.com/uwaJF.png" rel="noreferrer"><img src="https://i.stack.imgur.com/uwaJF.png" alt="enter image description here"></a></p>