title: Cycle Chain Mode button not show after create chain
body: <p>I'm using Android Studio 3.4.1.
  When i work with ConstraintLayout, i dragged 3 buttons into the layout, select all, and create horizontal chain. But Cycle Chain Mode button not showing after that. So, i can not select other options: Packed, Spread, Spread inside</p>
  
  <p>Is this part removed? or i need setup something.
  Thanks.</p>