Nikon D850 Menu Manual page 151

❚❚ Multi Selector
The multi selector on the battery pack can be used for focus-
point selection (x Focus point selection) or to duplicate the
role performed by the camera multi selector (Y Same as
camera multi selector; note that in this case, you can select
Info C/Playback D for Photo info/playback to reverse the role
of the buttons so that pressing the selector up or down displays
additional images and pressing the selector left or right changes
the photo information displayed).
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Menu Guide