Nikon NIKKOR Z 70-200mm f/2.8 VR S Lens - Manual (Page 179)

155 Menu List
Image overlay
Combine two existing NEF (RAW)
photos to create a single picture that is
saved separately from the originals. This
option is only available in the
N tab.
Trim movie
Trim footage to create edited copies of
movies.
Side-by-side comparison
Compare retouched copies to the
originals. This option is only available if
the retouch menu is displayed by
pressing
i and selecting Retouch in
full-frame playback when a retouched
image or original is displayed.