Nikon Z8 User Manual page 802

Sensor Shield Behavior at Power Off
If [Sensor shield closes] is selected, the shield in front of the image
sensor will close when the camera is turned off. This prevents dust
or other foreign matter collecting on the image sensor when lenses
are exchanged. It may also, however, increase camera startup times.
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Cautions: The Sensor Shield
The shield can be damaged by touching it when it is closed.
When exchanging lenses with the shield closed, be sure to insert the lens perpendicular to the
mount. If inserted at an angle, lenses could contact the sensor shield and damage the shield or the
image sensor.
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Sensor Shield Behavior at Power Off
G button U B setup menu