Nikon Z8 User Manual page 798

Choosing a Default Fine-Tuning Value
1
Select [AF fine-tuning options] in the setup menu, then highlight [Default] and press 2.
2
Press 4 or 2 to fine-tune autofocus.
Choose from values between +20 and −20.
The current value is shown by g, the previously-selected value by o.
The larger the fine-tuning value, the farther the focal point is from the lens; the smaller the
value, the closer the focal point.
3
Press J to save the new value.
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AF Fine-Tuning Options