Nikon D750 DSLR Camera (Body Only) - Manual (Page 391)

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This option controls the operation of the main and sub-
command dials.
f5: Customize Command Dials
G button
➜
A Custom Settings menu
Option Description
Reverse
rotation
Reverse the direction of rotation
of the command dials when they
are used to make adjustments to
Exposure compensation and/or
Shutter speed/aperture .
Highlight options and press 2 to
select or deselect, then press J .
This setting also applies to the command dials for optional
MB-D16 multi-power battery packs.
Change
main/sub
Exposure setting : If Off is selected, the main command dial
controls shutter speed and the sub-command dial controls
aperture. If
On is selected, the main command dial will
control aperture and the sub-command dial shutter speed.
If
On (Mode A) is selected, the main command dial will be
used to set aperture in shooting mode A only.
Autofocus setting : If On is selected, autofocus mode can be
selected by keeping the AF-mode button pressed and
rotating the sub-command dial, AF-area mode by keeping
the AF-mode button pressed and rotating the main
command dial.
These settings also apply to the command dials for the
MB-D16.