Filter knowledge results by category as a User and Agent

Summary:

We have a large volume of knowledge in our knowledge base and we are looking for the ability to be able to filter knowledge results based on category. For example, we have a category of Maternity and would like to be able to filter the results to only show articles linked to that category based on user selection.

We are looking to apply this to both the Service User (through My Help and .or the search results view) and the Service Agent View when searching for knowledge to filter the results

We are using the Redwood UI for Knowledge and whilst we can see examples for classic the same logic does not appear to be in place for redwood.