You need to upload larger images to make them as a square. For instance, set the 500×500 value – https://prnt.sc/oH9PEigLXyJ_ and recheck the appearance.
And the second queations i had, what if i want to make them round?
and an additional question, why do i have my categories in two places ?- see the image i insert you you. thanks
i only want the categories on top and not next to the products