This plugin adds a checkbox, “include this page in menus”, uncheck this to exclude pages from the page navigation that users see on your site.
This plugin adds a checkbox, “include this page in menus”, which is checked by default. If you uncheck it, the page will not appear in any listings of pages (which includes, and is usually limited to, your page navigation menus).
Pages which are children of excluded pages also do not show up in menu listings. (An alert in the editing screen, underneath the "include" checkbox allows you to track down which ancestor page is affecting child pages in this way.)