We have tested filters which are implemented as chips below the navigation bar. Usability test results were successful but also we gathered useful feedbacks about category structure.
1. Search "wurst"
2. How to filter search results by category?
3. List search results in a specific category which is "Wurstwaren, Schinken & Fischkonserven" (Sausages, ham and canned meat)
Would you like to test the prototype? (German) if yes, please click here