There are two ways to add filters on collections on Shopify. Firstly, you can set them up through redirects. In this case, Searchanise will redirect your customers from a collection page to the search results page with the same products.
The second way is to add filters by embedding HTML code into a Shopify's theme template. You'll need to modify the theme code to use the Searchanise collection template instead of the default one.
For more detailed instructions on adding filters, refer to our help portal