Missunderstanding of WordPress menus
I guess you mean the wp_page_menu fallback, where you can use the filters wp_page_menu_args and wp_page_menu to modify it’s output. Notice that this function is a wrapper for the wp_list_pages() function, that ships with the wp_list_pages_excludes and the wp_list_pages filters. That function is again wrapper for the walk_page_tree() function, that activates the Walker_Page class walker … Read more