Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 351)

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Erasing Images
Checkmarking [ X ] Images to Be Erased in a Batch
By adding checkmarks to the images to be erased, you can erase all those
images at once.
1 Select [ 3 : Erase images].
2 Select [Select and erase images].
3 Select an image.

Turn the <
5
> dial to select the image
to be erased, then press <
0
>.

To select another image to be erased,
repeat step 3.
4 Erase the images.
 Press the <
L
> button, then press [OK] .