WooCommerce integration comes as standard and there is very little setup required to get up and running but there are a few things to note:
Configure the Settings
First, set the Post Type to Products – you must only select this WooCommerce post type to get proper integration with the WooCommerce shop page (unless you want to search Variations, then see below).
Next, under the Display Results tab set the Display Results Method to WooCommerce Shop.
Search & Filter will now instantly be usable on the shop page, just be sure to add the widget to the shop page.
Attributes are actually Taxonomies – so simply add a Taxonomy field to your Search Form to add WooCommerce attributes as fields.
Just like Attributes, WooCommerce tags and categories are actually just custom taxonomies, so use a Taxonomy field in your forms to add these – they are usually listed as Product Tag and Product Category.
Search & Filter can now search across Product Variations, just be sure to add the Variations post type as well as the Products under the General tab.