The Touch Shutter - Nikon Z fc N2016 Reference Manual

through the frame. To end tracking and select the center focus point,
press J again. In photo mode, if subject tracking was initiated in
focus mode AF-C or AF-A by pressing the shutter-release button
halfway, the camera will track the subject only while the shutter-
release button is pressed; releasing the shutter-release button ends
tracking and restores the focus point selected before tracking started.
･ To exit subject-tracking mode, press the W (Q) button.
Subject tracking
D
The camera may be unable to track subjects if they:
･ are similar in color or brightness to the background,
･ change visibly in size, color, or brightness,
･ are too large or too small,
･ are too dark or too bright,
･ move quickly, or
･ leave the frame or are obscured by other objects.

The touch shutter

Touch the display to focus on the selected point. The shutter will be
released when you lift your finger from the display.
Focus
110