Canon EOS M200 Advanced User's Manual page 306

Rating
Rating by Specifying the Range
While looking at the images in the index display, you can specify the first
and last images for a range to rate all the specified images at once.
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1
Select [Select range].
Select [Select range] in [ 3 : Rating].
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2
Specify the range of images.
Select the first image (start point).
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Next, select the last image (end point).
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A checkmark [ X ] will be appended to
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all the images within the range between
first and last images.
3
Press the <M> button.
4
Rate the image.
Turn the <6> dial to select a rating
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mark, then select [OK].
All the images in the specified range will
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be rated (same rating) at once.