What is multi level filter?
Multi-level filtering allows administrators to filter questionnaire responses by using data filters. You can filter your survey data based on various parameters such as question, custom variables, geo-location, email list code, survey status, date filter, device type, and language.
How do I add a collection filter?
You can select Edit filters to select additional filters to be displayed in the sidebar of your collection page. After clicking on Edit filters, check the boxes of the options you wish to include as part of your collection filters. Click Save and check your work.