Focus-Point Selection - Nikon Z 8 Reference Manual

Focus-Point Selection

Except when [Auto-area AF] is selected for AF-area mode, the focus point can be selected manually,
allowing photographs to be composed with the subject positioned almost anywhere in the frame.
Use the multi selector to select the focus point while the standby timer is on.
Pressing J selects the center focus point.
Tip: The Sub-Selector
The sub-selector can be used for focus-point selection in place
of the multi selector.
Exposure and focus lock while the center of the sub-selector is
pressed.
Be careful not to put your fingers in your eye while using the
sub-selector with your eye to the viewfinder.
Tip: Focus-Point Lock
Focus-point selection can be locked by choosing [ON] for Custom Setting f4 or g3 [Control lock] >
[Focus-point lock].
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Focus