Canon EOS-1D X Mark III Advanced User's Manual page 550

[Select by rating]
Specify viewable images depending on whether a rating is appended (or
not appended) or by the type of rating.
Once you select the type of rating, the viewable images are set.
[File number range] (Select range)
Select the first and last images from images arranged by the file number to
specify the viewable images.
1. Press < > to display the image selection screen.
Use the < > dial to select images.
You can press the <
counterclockwise to select the image using the index display.
2. Select an image as the starting point (1).
3. Use the < > dial to select an image as the ending point (2).
4. Select [OK].
> button and turn the <
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> dial