facetwp woocommerce archive only facets

custom-hooks.php

<?php
/** for sites that only use facets on woocommerce archive pages -
 ** shop page, product category archives, product tag archives,
 ** any others auto-created by woocommerce
 ** not for [product] shortcode or custom queries
 **/

add_filter( 'facetwp_is_main_query', function( $is_main_query, $query ) {
    if ( 'product_query' != $query->get( 'wc_query' ) ) {
        $is_main_query = false;
    }
    return $is_main_query;
}, 10, 2 );