Show more than 1 collukn product in mobile

Hi,
We have the Pro version of storevilla.
If you open the website https://www.tartaruguita.pt/product-category/brinquedos/ar-livre/ in a mobile phone, you will see only one product column. How can I define to show 2 or more columns in mobile with proper re-sizing.

Thanks

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