To lock the screen, you just click the connection tab and apply the checkbox, then to unlock you have to lock/unlock the device with the physical lock button.
1. Press t he connection ("...") tab.
2. Check the lock screen option and press OK.
3. MDash is now locked for any input, to unlock, you need to lock the android screen, and unlock and then MDash will be unlocked.
4. Press device OFF and then ON to unlock MDash screen again.
