Nikon Z8 User Manual page 714

5
Press the button you intend to use for recall of the focus
position saved in Step 4.
Of the controls to which [Recall focus position] was
assigned in Step 1, press the control you intend to use for
recall of the focus position saved in Step 4.
A message will appear in the shooting display if the
operation is successful.
Repeat Steps 4 to 5 to save additional focus positions to the
other controls to which [Recall focus position] is assigned.
6
Press the control for the desired focus position.
The focus position saved to the control in question will be
restored.
Holding a control to which [Recall focus position] is
assigned activates manual focus (MF), and the camera will
not refocus if the shutter-release button is pressed halfway
while the control is pressed.
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f2: Custom Controls (Shooting)