To hide a page, go to the vertical management bar on the left side of the editor, and click on the Pages tab.
The pages of your site appear in the site's navigation menu and are displayed in a list.
From your list of pages, click on the three-dot icon "..." or double-click on the page you want to hide.
Click on Hide.
Show the page again
From your list of pages, click on the three-dot icon or double-click on the page you want to show.
Click on Show.