[Theme: Pronto] problem with featured pictures on the post page

Hi there,
I’m trying to find out how to change featured photos that appear on the post page. In thumbnails the fotos are centred and the whole products are visible, instead on the post page you can see only a part of the product. Can someone help me? I will be very grateful ??
Thanks and greetings from Italy ??
https://www.recenzjeori.pl/