// Sort Store taxonomy in alphabetical order
add_filter( 'wcfm_vendor_store_taxomonies', function( $taxonomies, $vendor_id, $taxonomy ) {
    $terms = [];
    foreach( $taxonomies as $term_id => $termArray ) {
        $term = get_term( absint( $term_id ), $taxonomy );
        $terms[$term_id] = isset( $term->name ) ? $term->name : '';
    }
    asort($terms);

    foreach( $terms as $term_id => $term ) {
        $terms[$term_id] = $taxonomies[$term_id];
    }

    return $terms;
}, 10, 3 );