title: Chromebook kiosk mode, disable switch to ChromeOS
body: <p>When kiosk app starts on Chromebook it shows message "Switch to ChromeOS by pressing "<strong>CTRL-ALT-S</strong>" keys. 
  I would like to disable posibility to switch to ChromeOS, I just want to run kiosk app on the `Chromebook. </p>
  
  <p>Kiosk mode is set on Google Admin Console, app that starts automatically is specified and all works OK. However during ChromeOS bootup, there is for a 5 sec option to switch to ChromeOS by pressing CTRL-ALT-S" keys.</p>
  
  <p>Is there a way to disable this option to switch to ChromeOS on Google Admin Console? </p>
  
  <p>Thanks</p>