Hi fabiotoscano.it,

Thanks for reaching to us.

Navigate to Theme Settings > Products archive > Products styles and enable Hover image option https://prnt.sc/VgIGETXXJ3Ms

In order to display more images, please enable Product gallery option as well https://prnt.sc/KN6gSSF6rUQc

And make sure you uploaded Product Gallery Images for product https://prnt.sc/0al0om0vL4ul

Regards,