Hi,
You've configured the module to display only the products which have the "product category" main category selected in their "categories" setting.
It's likely you don't have any products like that. The products must be linked to sub categories of the main category.
If you want to display all the products, regardless of whether they are directly or indirectly linked to the main category, you want to change the "sub elements filter" setting under the "HikaShop options" tab to "all sub elements".
This should hopefully lead to your module displaying your products.