G7: Af Tracking Sensitivity - Nikon Z 8 Reference Manual

g7: AF Tracking Sensitivity

The AF tracking sensitivity for video mode can be set to values of
from 1 to 7.
Choose [7] ([Low]) to help maintain focus on your original
subject.
If the subject leaves the selected focus point when [1] ([High]) is
selected, the camera will respond by quickly shifting focus to a
new subject in the same area.
G button U A Custom Settings menu
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g7: AF Tracking Sensitivity