FacetWP is a high-quality WordPress tool that allows you to add personalized searches to your e-commerce sites, resource galleries, and more. It comes with settings that only show custom values.
The FacetWP WordPress plugin comes with 11 predefined search types, including dropdowns, date ranges, checkboxes, sliders, and even near geolocation.
Demo:
WordPress Filtering and Faceted Search Plugin | FacetWP
Advanced filtering and faceted search for WordPress and WooCommerce
facetwp.com