Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 255)

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Focus Bracketing (Live View Shooting)
Focus bracketing* enables continuous shooting with the focal distance
changed automatically after a single shot. From these images, you can
create a single image in focus over a wide area by using an application
that supports depth compositing, such as Digital Photo Professional (EOS
software).
* “Bkt.” stands for bracketing.
1 Select [ z : Focus bracketing].
2 Specify [Focus bracketing].

Select [Enable] .
3 Set the number of images.

Specify the number of images captured
per shot.

Can be set in a range of [2] – [999] .