title: Xcode 10: Storyboard not showing Identity, Attribute... Inspector
body: <p>After I update to Xcode 10, The storyboard is acting very weird. Sometimes it's not showing anything for Identity, Attribute, Size, and Connection Inspector and even I clean the project also restart my Xcode and it's still the same. Here is an Image example: 
  <a href="https://i.stack.imgur.com/2cYIl.png" rel="noreferrer"><img src="https://i.stack.imgur.com/2cYIl.png" alt="enter image description here"></a>  </p>
  
  <p>How to solve this problem?</p>