Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 350)

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Erasing Images
You can either select and erase unnecessary images one by one or erase
them in one batch. Protected images ( = 346) will not be erased.
o Once an image is erased, it cannot be recovered. Make sure you no
longer need the image before erasing it. To prevent important images
from being erased accidentally, protect them.
Erasing a Single Image
1 Select the image to be erased.
 Press the <
x
> button.
 Select with <
5
>.
2 Press the < L > button.
3 Erase the images.
JPEG or RAW images or movies

Select [Erase] .
RAW+JPEG images

Select an item.