Only for Android 5 or below
The option "None" in "Choose screen lock" disappeared after entering guest mode
Please follow below steps to find " None " option back under Screen lock :
1. Tap " Users " on Settings page.
2. Tap " Guest ".
3. Tap " Users " on Guest Mode Settings page.
4. Tap " Remove guest ".
5. Tap " Remove ".
6. Return to owner mode and tap Settings >Lock screen > Screen lock .
" None " option will display on Choose screen lock page.
