Fixing product-setup

Hello guys

I have a webshop where the products in the category-sites are shown 3-by-3 on PC, but on the phone only one product is shown pr. row. I would like to change this to two pr. row. How do I do that? 🙂

And also, where do I change the number of products shown on each page?

I assume this must be some standard settings, but I just cant find it.

Best regards

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