Nikon Z8 User Manual page 800

Save Focus Position
When [ON] is selected, the camera will save the current focus position when turned off and restore it
when next turned on. Note that this increases camera startup times.
Note that even when [ON] is selected, if the temperature, zoom position, or other conditions
change while the camera is off, focus may resume from a different position when the camera is
turned on.
Similarly, note that even when [OFF] is selected, focus may resume from the previously-selected
position depending on the state of the camera and lens.
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G button U B setup menu
Save Focus Position