facetwp only facetwp=>true for main query

<?php
/** only use queries with facetwp=>true
 **/
add_filter( 'facetwp_is_main_query', function( $is_main_query, $query ) {
    if ( true !== $query->get( 'facetwp', false ) ) {
        $is_main_query = false;
    }
    return $is_main_query;
}, 10, 2 );