Nikon D500 - Manual (Page 60)

60 Menu Guide
Highlight Yes and press J to restore movie shooting menu
options to their default values ( 0 13).
Choose the three-letter prefix used in naming the image files in
which movies are stored. The default prefix is “DSC” (
0 39).
Choose the slot to which movies are
recorded. The menu shows the time
available on each card; recording ends
automatically when no time remains.
Choose the image area for movies from DX and 1.3×.
Reset Movie Shooting Menu
G button
➜ 1 movie shooting menu
File Naming
G button
➜ 1 movie shooting menu
Destination
G button
➜ 1 movie shooting menu
Choose Image Area
G button
➜ 1 movie shooting menu