Nikon NIKKOR Z 70-200mm f/2.8 VR S Lens - Manual (Page 113)

89 Shooting Controls
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Locking Focus and Exposure
Follow the steps below to use focus and exposure lock.
1
Set focus and exposure.
Position the subject in the selected focus point and press the
shutter-release button halfway to set focus and exposure.
Check that the focus point is displayed in green.
2
Lock focus and exposure.
With the shutter-release button
pressed halfway, press the center of
the sub-selector to lock both focus
and exposure (an
AE-L icon will be
displayed).
Shutter-release button
Sub-selector