title: Disable grid in chrome device emulation
body: <p>I know this question may not fit well here but this really is driving me crazy for few hours now :( I use chrome to simulate how websites look on different mobile devices. I clicked something wrong that led to a grid with rulers to appear. I don't know WTF to do to disable this grid. This is the screenshot:</p>
  
  <p><img src="https://i.stack.imgur.com/bQbm9.jpg" alt="enter image description here"></p>
  
  <p>I uninstalled and reinstalled the browser and it returns back.
  I reset the developer tools to default settings and it's still there.</p>
  
  <p>This is really becoming a nightmare for me for few hours now. I want the regular emulation without these rulers and grid and top bar. Thanks</p>