Nikon Z 8 Reference Manual page 116

D
Cautions: Taking Pictures Using Touch Shooting Options
Touch controls cannot be used for manual focus.
The shutter-release button can be used to take pictures when the W icon is displayed.
During burst photography, touch controls can be used only to take one picture at a time. Use the
shutter-release button for burst photography.
In self-timer mode, focus locks on the selected subject when you touch the monitor and the shutter
is released about 10 seconds after you lift your finger from the display. If the number of shots
selected is greater than 1, the remaining shots will be taken in a single burst.
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Focus