Nikon D750 DSLR Camera (Body Only) - Manual (Page 361)

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Select the increments used when making adjustments to ISO
sensitivity (
0 134). If possible, the current ISO sensitivity setting
is maintained when the step value is changed. If the current
setting is not available at the new step value, ISO sensitivity will
be rounded to the nearest available setting.
Select the increments used when making adjustments to shutter
speed, aperture, exposure and flash compensation, and
bracketing.
b: Metering/Exposure
b1: ISO Sensitivity Step Value
G button
➜
A Custom Settings menu
b2: EV Steps for Exposure Cntrl
G button
➜
A Custom Settings menu