Reduce screen brightness: You can either turn the screen off by giving the far left button a quick press, or, adjust the screen brightness in settings by clicking the center "settings" button > "Display" > "Screen" > and reduce the brightness level

Enter power saving mode: Create your own custom power saving mode by entering the settings menu and clicking > "Performance" > "Power Saving" > and adjust the settings as you wish.

Change the sensor mode: Change sensor mode to "Default" by clicking the center "settings" button > "Performance" > "Sensor Mode" > "Default."