Lenovo TB-X103F User Manual page 5

Force shutdown
Press and hold the On/Off button until the screen goes dark.
Rotating your device
Enabling the screen rotation makes all applications automatically rotate upwards
or downwards.
Go to Settings > Display > When device is rotated to open the screen
rotation function.
Rotate the contents of the screen
The screen orientation changes automatically.
Stay in current orientation
The orientation is locked.