[narrative theme] two products in a row on mobile view

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Can someone help me to adjust the products per row? I think this is done via the code, because I have extended the number of products per row/column and it works fine on the website, but on the mobile view all products are lined up 

i just want to change the mobile view and do 2 products per row

Url: https://printyourpics.de/


thanks for your help