Why is the brightness too high/low when watching HDR videos on the Xiaomi 15 Ultra?

To restore realistic visual experiences and enhance the HDR experience, the Xiaomi 15 Ultra automatically adjusts the brightness appropriately when playing HDR videos. If you wish to adjust the display brightness, you can enter the control center to manually adjust the screen brightness.
For your reference, here are more details about HDR adjustment:
1. HDR adjustment can make the highlights and shadows in the picture clearer and enhance the sense of detail. You can better see the details and color transitions in the videos;
2. HDR adjustment helps reduce the stimulation of the eyes caused by overly bright screens.