Canon EOS R50 Instruction Manual page 554

Rating All Images in a Folder or on a Card
You can rate all the images in a folder or on a card at once.
Under [ : Rating], when you select [All images in folder] or [All images on card], all
the images in the folder or on the card will be rated.
Turn the < > dial to select a rating, then select [OK].
When you are not rating images or canceling the rating, select [ ].
If the search conditions are set with [ : Set image search conditions] ( ), the
display will change to [All found images].
If you select [All found images], all the images filtered by the search conditions will be
rated as specified.
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