How to hide the featured image in woocommerce category page

Hi,
I've installed woocommerce and all the categories and products page generated automatically show a picture in the beginning of the page. I could hide it in pages deleting the featured image editing the page. However, in these pages generated automatically (woocommerce categories, products, i.e) I can't do it. I tried to do it within the Betheme options, but unfortunately I couldn't manage to hide it.
Could you tell me how can I hide the featured image so that it doesn't appear in all automatic generated pages?

Thank you!

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