For information on how this works and to set this up, please check out our support article How to set up group tag filters.
This only works with product tags and the number of groups are limited to the amount that the theme offers. If you are looking for more options or a complex filtering system, then you would either need to use an app or hire a developer to build something custom for your store.
There are apps available for filtering all of which work fine with our themes (as far as we know!)
Please note it is the responsibility of the app developers to ensure their products work with all themes on the Shopify theme store, so you’ll need to reach out to the relevant developer if you do have any issues during installation.