Nikon D500 - Manual (Page 83)

83 Menu Guide
Select the increments used when making adjustments to ISO
sensitivity. If possible, the current ISO sensitivity setting is
maintained when the step value is changed. If the current ISO
sensitivity 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, and bracketing.
Select the increments used when making adjustments to
exposure and flash compensation.
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
b3: Exp./Flash Comp. Step Value
G button
➜ A Custom Settings menu