There are many ways to restrict access to pages, content elements and other information in your TYPO3 CMS installation. Options can range from hiding pages in menus, to limiting visibility of content for a set time period, all the way through to requiring visitors to log in to view content.
When an element is hidden, be it a page, a content element or a news item, it will not display in the frontend. You can, however, preview it in the backend.
Find out how to configure content and pages to only be visible to frontend users who have logged in to a restricted area.