'main_menu',
'menu_class' => 'nav navbar-nav navbar-right smartlib-menu smartlib-navbar-menu',
'fallback_cb' => 'wp_bootstrap_navwalker::fallback',
'walker' => new wp_bootstrap_navwalker()
));
} elseif ($one_page_check) { //display one page menu
if ($page_children->have_posts()) : ?>