Faceted Search
The Oxygen Feedback search engine supports facets and faceted search functionality. Facets are predefined categories that are associated with search results. Users can select one or more of these facets when searching WebHelp output to narrow down their search results to a specific category or set of categories, and the search engine will only display results that match all the selected facets.
How to Add Facets to WebHelp Responsive for DITA Output
To learn more about how to define facets and associate them with your topics see the: How to Configure Faceted Search in WebHelp Output topic from Oxygen XML WebHelp documentation.