Show categories in shop

So, newbie here.. I have made a website using WP, and now a webshop. Problem is, I cant get the categories to show. I have one main category, and that shows. However, the sub-categories do not show. So, when entering the main category, all products list in random order. I want the visitor to see the sub-categories when visiting, and then browse the products. I posted this before, but no solution.

 

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