Create a Hidden Page
When creating a new page, check the box to "Exclude from Navigation" as pictured below.
Hidden pages do not appear in any navigation menu, but will appear in your site map in a lighter color text with the "hidden" designation.
Change the Hidden Setting for Existing Pages
Highlight the page in your site map by clicking on the the row, then click the gear icon.
In the popup window, check or uncheck the box for "Exclude from Navigation"
Q: Can I hide a group of pages?
A: Yes. Use a hidden folder.