Nikon Z 8 Reference Manual page 871

Battery-chamber cover
18
holder
Sub-command dial for
19
vertical shooting
20 Control lock
Shutter-release button
21
for vertical shooting
Fn button for vertical
22
shooting
22
21 20
Holds the camera battery-chamber cover while it is removed from
the camera.
Performs the same role as the matching control on the camera.
Locks the controls on the MB-N12 to prevent accidental operation.
The control lock is not a power switch. Use the power switch on
the camera to turn the camera on or off.
Performs the same role as the matching control on the camera.
Performs the roles assigned using Custom Settings f2 [Custom
controls (shooting)], f3 [Custom controls (playback)], and g2
[Custom controls] in the camera menus.
871
18
19
Optional MB-N12 Power Battery Packs