Monitor Brightness

G button U B setup menu

Press 1 or 3 to adjust monitor brightness. Choose higher values for increased brightness, lower values for reduced brightness.

[Monitor brightness] can only be adjusted when the monitor is the active display. It cannot be adjusted when [Viewfinder only] is selected for monitor mode or when your eye is to the viewfinder.
Higher values increase the drain on the battery.
Changing the option selected for [Monitor brightness] in the setup menu when [HLG] is selected for [Tone mode] in the photo shooting menu or when viewing pictures taken with [HLG] selected for [Tone mode] changes the distribution of tones in the shooting and playback displays. The fidelity of reproduction in highlights in particular declines as brightness rises.