title: Center align multiple layers
body: <p>I have a button with 3 layers: Rounded Rectangle for outline, arrow icon and text, like this:</p>
  
  <p><img src="https://i.stack.imgur.com/KJ1JJ.jpg" alt=""></p>
  
  <p>How do I center align the arrow and text to the rectangle without merging them in one layer? I tried linking them together and then align to selection, but that way they get stacked on top of each other.</p>