Hello,
When you have 3 images per row on the Shop page, the size of the container with image is – https://prnt.sc/sjrI6qnjGaOS , so go to Theme Options > WooCommerce > Product images > Larghezza Della Miniatura > set 360 and then regenerate thumbnails using a plugin, as described there – https://xstore.helpscoutdocs.com/article/89-product-images
or just set 4 products per row via Theme Options > WooCommerce > Catalogo prodotti > Prodotti Per Riga.
Regards