Canon EOS 80D - Manual (Page 360)

3 Setting Ratings
360
A total of up to 999 images of a given rating can be displayed. If there are
more than 999 images with a given rating, [###] will be displayed.
Taking Advantage of Ratings
 With [32: Image jump w/6], you can display only images having the
specified rating.
 With [32: Slide show], you can play back only images having the
specified rating.
 Depending on the computer OS, you can see each file’s rating as part of
the file information display or in the provided image viewer (JPEG
images only).