'primary', 'container_class' => 'collapse navbar-collapse', 'container_id' => 'navbarNavDropdown', 'menu_class' => 'navbar-nav ml-auto', 'fallback_cb' => '', 'menu_id' => 'main-menu', 'depth' => 2, 'walker' => new Understrap_WP_Bootstrap_Navwalker(), ) ); ?>