The screen brightness of Canon r8 does not change with exposure.

1. First, press the menu button at the top left of the screen, switch to the menu bar marked with wrench, find the LCD brightness option, and enter the LCD brightness setting.

2. Secondly, by changing the brightness setting from automatic to manual, the corresponding brightness can be adjusted.

3. Finally, if the screen brightness does not change with the exposure, it can be achieved by setting a large aperture (reducing the F value of the aperture), reducing the shutter speed or improving ISO.