Lenovo L79031 User Manual page 16

Go to Settings > 4D U-Touch , tap U-Touch switch to turn it on, and then learn
to use the U -Touch:
Back: Swipe in from the left or right edge.
Home : Swipe up from the bottom of the screen.
Recents : Swipe up from the bottom of the screen and hold .
Note: The buttons at the bottom of the screen will be hidden .
Also, you can follow the instructions below to open the camera anytime by twisting
your wrist twice:
Go to Settings > 4D U-Touch .
Tap Twist for quick capture .
Make sure the turn on switch is open..
Twist your wrist twice to open the camera. .
4D U-Touch