Woocommerce, Thumbnail size

Hi everybody,

I’m having trouble locating where I can set the thumbnail size of the Woocommerce product images in the photo gallery.
Actually, there is only the place ‘customizer’ for Woocommerce and everything is set correctly there.
However, images on the above page are consistently output in the Photos tab in 160×120 format and appear blurry when I resize them.
In the media gallery actually corresponding thumbs are generated and I am at the end with my Latin, where I can turn off or change.
The programmer of the theme says that it is necessarily due to Woocommerce.

I would be very pleased to hear from you and send warm regards to all here,

Ingo

The page I need help with: [log in to see the link]