title: Relative Layout missing from the last version of Android Studio
body: <p>activity_main is a relative layout, but android studio can't recognise it. Also, in the layout menu there's no relative layout, and the I can't move the button freely, it's stuck in that corner, I need to give it margin or to align it. This happened after I updated my android studio to the lastest version. What can I do? I need to work with that layout.</p>
  
  <p><a href="https://i.stack.imgur.com/8XSJC.png" rel="nofollow noreferrer">https://i.stack.imgur.com/8XSJC.png</a></p>