Show products in three columns on mobile?

Hi,

Here is the page I'm trying to adjust: https://www.onyxmodelmanagement.com/merch

I'm trying to make the products show up in three columns on mobile, instead of two. Can someone help me?

Thanks!!

Three columns on mobile will undoubtedly make the titles overlap and become completely unreadable, there's a reason that you want to reduce the number of columns on mobile.