1. Turn on your mobile phone and set it in the main interface. Click to enter the settings, where you can see various settings such as notification and status bar, wallpaper, personality theme, font, font size, sound and vibration, and most of the function settings in Xiaomi mobile phone can be completed here.

2. You can see "Other Advanced Settings" by sliding down in the settings interface, and the function we are looking for is here. Click "Other Advanced Settings" to see security and privacy, date and time, language and input method, etc. Click "Power and performance"

3. You can see a power-saving optimization in the interface of power and performance, which is the key step of our setting.

4. click to enter power saving optimization, and then click power saving mode to add a custom mode here.

5. Click Sleep in the custom mode, and then you can set the sleep time of the mobile phone. Just choose "Never". After successful setting, your mobile phone will not sleep actively when you don't click the power button, and the screen will be always on.