title: Android Studio 14. Why are there 2 identical screens (white and green) in the activity_main.xml layout designer?
body: <p>Android Studio 14.<br />
  Why are there 2 screens (white and green) in the activity_main.xml layout designer ?</p>
  <p>They appear to do the same thing.</p>
  <p>I don't recall this in older versions of Android Studio</p>