Nikon D7200 body - Manual (Page 114)

114 Menu Guide
Press 1 or 3 to choose monitor brightness for playback, menus,
and the information display. Choose higher values for increased
brightness, lower values for reduced brightness.
Monitor Brightness
G button
➜ B setup menu
A
Monitor Brightness
Values of +4 or higher make the monitor easier to read in bright light
but also result in yellow colors taking on a greenish cast. Choose lower
values for accurate color reproduction. The option selected for
Monitor brightness in the setup menu has no effect on the brightness
of the display during live view, which is instead adjusted using the
Monitor brightness option in the
i-button menu.