Nikon D810 - Manual (Page 260)

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A
Rotate Tall
To display “tall” (portrait-orientation)
photographs in tall orientation, select On
for the Rotate tall option in the playback
menu (0 288).
A Image Review
When On is selected for Image review in the playback menu (0 287),
photographs are automatically displayed in the monitor after shooting
(because the camera is already in the correct orientation, images are
not rotated automatically during image review). In continuous release
modes, display begins when shooting ends, with the first photograph
in the current series displayed.
A Retouch and Editing
To create a retouched or edited copy of the photo or movie currently
displayed in full-frame playback, press the b button and choose an
option.