Press and hold the rightmost button (Screen Lock Button) for approximately 3 seconds until you find the prompt “Screen Locked”, then release the button.
⚠️ Please do not hold too long, or the device will restart.

Long-press the fourth button on the top of the device for about 2 seconds to lock the screen.

Double-press the third button on the top of the device to lock the screen.

Long-press and hold the button on the back of the device for about 2 seconds to lock the screen.