1. Open the control center: Slide the bottom of the screen upward to open the control center.
2. Find the screen brightness control: the small box of screen brightness is at the far left of the control center. If you hold down this box for a long time, the screen will darken and a screen brightness slider will appear on it.
3. Adjust the screen brightness: slide your finger on the screen brightness slider to brighten or darken the screen.
4. Enable the TrueTone function: TrueTone is a display technology of Apple, which can automatically adapt to the color temperature and light intensity of the surrounding environment to obtain a more natural look and feel experience.
5. Adjust the display mode: optimize the viewing experience and adjust the display mode of iPhoneXR.