Nikon D750 DSLR Camera (Body Only) - Manual (Page 382)

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At the default setting of MTR > under > over ( H ), exposure,
flash, and white balance bracketing are performed in the order
described on pages 204 and 209. If
Under > MTR > over ( I ) is
selected, shooting will proceed in order from the lowest to the
highest value. This setting has no effect on ADL bracketing.
This option determines the role assigned to the J button
during viewfinder photography, playback, and live view
(regardless of the option selected, pressing
J when a movie is
displayed full frame starts movie playback).
❚❚
Shooting Mode
e7: Bracketing Order
G button
➜
A Custom Settings menu
f: Controls
f1: OK Button
G button
➜
A Custom Settings menu
Option Role assigned to J button
J
Select center
focus point
Select the center focus point.
K
Highlight active
focus point
Highlight the active focus point.
None
Pressing the J button has no effect in viewfinder
photography.