Plugins kategorisearre as page tree | https://fy.wordpress.org

Nested Pages provides a drag and drop interface for managing pages & posts in the…

Get a tree view of all your pages directly in the admin menu. Search, add,…

Widget Pack is a WordPress plugin that enables essential, yet powerful features for your website.

Widget to display a navigable tree of pages.

Create visual hierarchies of site pages. Options to list all pages, subpages, current page siblings.…

wp_list_sub_pages will list only pages within the same category (top-level parent) as the current page.