Im using the free theme Origin.
I had to go to Online Store->Theme->Edit code->snippets->cart-drawer.liquid (for me line 43)
and replace the code {{ routes.all_products_collection_url }} with the url I wanted.
Changing the url in Online Store->Theme->Edit code->Sections->main-cart-items.liquid (in two places) did not have any effect.
Maybe because I am using the cart as a pop-up to the side for which i believe the cart-drawer.liquid is responsible.
I also