Profile: Karin

add_filter( 'wpv_filter_user_query', 'sort_by_lastname_func', 100, 3 );
  
function sort_by_lastname_func( $query_args, $view_settings, $view_id ) {
    if ($view_id == 123 ) {
        $query_args['meta_key'] = 'last_name';
        $query_args['orderby'] = 'meta_value';
        $query_args['order'] = 'ASC';
    }
    return $query_args;
}