Nikon Z 9 - AF-C In-Focus Display

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Custom Settings: Fine-Tuning Camera Settings
AF-C In-Focus Display
Choose whether the focus point changes color when the subject is in
focus in focus mode AF-C.
Option Description
[ON]
The focus point is displayed in green when the camera judges
that the subject is in focus.
[OFF]
The active focus point is displayed in red or yellow at all times,
whether or not the camera is in focus.