Canon EOS 5D MARK IV Instruction Manual page 418

Setting Ratings
3 Set Ratings with the Menu
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.
416
Select [Rating].
1
Under the [32] tab, select [Rating],
then press <0>.
Select the image to be rated.
2
Turn the <5> dial to select the
image to be rated.
If you press the <u> button and turn
the <6> dial counterclockwise, you
can select an image from a three-
image display. To return to the single-
image display, turn the dial clockwise.
Rate the image.
3
Press <0>, and a blue highlight
frame will appear as shown in the
screenshot.
Turn the <5> dial to select a rating,
then press <0>.
When you set a rating mark to the
image, the total number of the images
displayed beside the rating mark will
be counted up.
To rate another image, repeat steps 2
and 3.