FacetWP - index EDD FES (Front End Submissions) multi-select values

test.php

<?php

function index_EDD_FES_multiselect( $params, $class ) {
    if ( 'product_style' == $params['facet_name'] ) {
        $choices = explode( '| ', $params['facet_display_value'] );
        foreach ( $choices as $choice ) {
            $params['facet_value'] = $choice;
            $params['facet_display_value'] = $choice;
            $class->insert( $params );
        }
        return false;
    }
    return $params;
}

add_filter( 'facetwp_index_row', 'index_EDD_FES_multiselect', 10, 2 );