Canon EOS Rebel SL3 DSLR Camera with 18-55mm Lens (Black) - Manual (Page 309)

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Protecting All Images in a Folder or on a Card
You can protect all the images in a folder or on a card at once.
When you select [All images in folder]
or [All images on card] in [ 3 : Protect
images] , all the images in the folder or on
the card will be protected.
To cancel the selection, select [Unprotect
all images in folder] or [Unprotect all
images on card] .
z If you format the card ( = 66), the protected images will also be
erased.
z Movies can also be protected.
z Once an image is protected, it cannot be erased by the camera’s erase
function. To erase a protected image, you must first cancel the protection.
z If you erase all the images ( = 312), only the protected images will remain.
This is convenient when you want to erase all unnecessary images at once.