Searchanise
AKA: Smart Search & Instant Search
Adds a search filtering tool to the front end site on the search page, and optionally collection pages.
From the Apps menu, select Visit Shopify App Store button and search for Searchanise - it may be called Smart Search & Instant Search. Select app and follow the instructions
To edit the look of the Searchanise widget on your site, select the app through the admin panel.
Edit the look of the sidebar widget including colours and custom css
Edit the look of the dropdown box widget on the search input including colours and custom css
Manage which filters to show on the sidebar widget, these are generally groups of tags to filter by
