Nikon D500 User Manual page 328

f3 Shutter spd & aperture lock
Shutter speed lock
Aperture lock
f4 Customize command dials
Reverse rotation
Change main/sub
Aperture setting
Menus and playback
Sub-dial frame advance
f5 Multi selector
Restart standby timer
Do nothing
f6 Release button to use dial
Yes
No
302
Lock shutter speed at the value
currently selected in mode S or M, or
aperture at the value currently selected
in mode A or M.
Choose the roles played by the main
and sub-command dials.
Choose whether using the multi
selector activates the standby timer
(0 39).
Selecting Yes allows adjustments that
are normally made by holding a button
and rotating a command dial to be
made by rotating the command dial
after the button is released. Setting
ends when the button is pressed again,
the shutter-release button is pressed
halfway, or the standby timer expires.
(defaults to Do nothing)
(defaults to No)