Ark: Survival Evolved - HDR Settings

The peak brightness in the game seems to be fixed and not adjustable. This game does not seem to use the PS4, PS5 and Xbox HDR system calibration settings. 

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The main peak brightness limit is about 1000 nits. 

Frequent light sources (for example, the sky) usually have a brightness of 500-800 nits, but the brightness of the UI on a bright background can sometimes reach 1600 nits, but this is not critical. If your TV's brightness is very different from 1000 nits, use your TV's tone mapping modes.