To lock the Redmi Watch 5, please refer to the following details:
1. By default, if there is no operation within 5 seconds, the screen will be automatically locked. You can modify the screen off time in [Settings] >> [Display] >> [Auto lock] >> select from the options from 5 seconds to 60 seconds;
2. The watch supports the function of covering to sleep. After turning it on, cover and touch the watch with your palm. When the covered area reaches 1/2, the screen will automatically be locked;
3. Turn the wrist to lock the screen, turn the wrist watch in the opposite direction to lock the screen;
4. Put your hands down to lock the screen, the screen will be locked when your arm is put down.