title: No "Docked Mode" option in "Preview" settings in Android Studio once undocked
body: <p>Here is the Docked mode option for "Preview" window.</p>
  
  <p><img src="https://i.stack.imgur.com/YUk7R.png" alt="Preview Setting with Docked mode option"></p>
  
  <p>I removed the docked mode i.e. undocked it. And here is what I got.</p>
  
  <p><img src="https://i.stack.imgur.com/4NTlA.png" alt="Preview Setting without Docked mode option"></p>
  
  <p>There is no more "Docked Mode" option. Now I cannot properly work with designing layouts. Preview automatically hides when I change anything in the layout.</p>