Nikon D500 - Manual (Page 299)

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In full-frame, zoom, and thumbnail playback, the L (Z/Q)
button can be used to protect photographs from accidental
deletion. Protected files can not be deleted using the
O (Q)
button or the Delete option in the playback menu. Note that
protected images will be deleted when the memory card is
formatted (
0 304).
To protect a photograph:
1
Select an image.
Display the image in full-frame playback or playback zoom or
highlight it in the thumbnail list.
2
Press the L (Z/Q) button.
The photograph will be marked with a
P icon. To remove protection from
the photograph so that it can be
deleted, display the photograph or
highlight it in the thumbnail list and
then press the
L (Z/Q) button.
Protecting Photographs from Deletion
A
Removing Protection from All Images
To remove protection from all images in the folder or folders currently
selected in the Playback folder menu, press the
L (Z/Q) and O (Q)
buttons together for about two seconds during playback.
L (Z/Q) button