Nikon D850 Menu Manual page 16

f2 Multi selector center button (0 142)
Shooting mode
Playback mode
Zoom on/off
Live view
f3 Shutter spd & aperture lock (0 144)
Shutter speed lock
Aperture lock
f4 Customize command dials (0 144)
Reverse rotation
Change main/sub
Aperture setting
Menus and playback
Sub-dial frame advance
f5 Multi selector (0 147)
f6 Release button to use dial (0 147)
f7 Reverse indicators (0 148)
f8 Live view button options (0 148)
f9 D switch (0 148)
f10 Assign MB-D18 buttons (0 149)
Fn button
Fn button + y
AF-ON button
Multi selector
Photo info/playback
16 Menu Guide
Option Default
Select center focus point
Zoom on/off
Low magnification (50%)
Select center focus point
Off
Off
Exposure compensation: U
Shutter speed/aperture: U
Exposure setting: Off
Autofocus setting: Off
Sub-command dial
Off
10 frames
Do nothing
No
Enable
LCD backlight (D)
AE lock (Reset on release)
None
Same as camera AF-ON button
Same as camera multi selector
Info D/Playback C