Mark a Search Filter Required
Administration > Manage Search Filters
To mark a search filter as required, click the Edit (pencil) icon.
Click Yes in the Required column to require applicants to use this search filter. Applicants will not be able to perform a search without first selecting a value in this filter’s search field.
Scroll down to the bottom of the screen and click the Save or Save & Exit button.
Change the Required setting to No to make the search filter optional for applicants.