How to hide content
Hide an entire page
- Edit the Page Properties
In the Access tab, check the Page Disable checkbox
Warning: checking the In Menus Hide checkbox will remove the page from navigation menus, but the page will still be available to Web visitors who know the Page URL after the change is published
- Save and publish as usual
Hide a content element
To leave a page available to Web visitors, but hide a specific content element
- Edit the content element
- In the Access tab, check the Content Element Disable checkbox
Why not delete?
If you're reasonably sure the content will be needed again, hiding a page/content gives you the ability to easily re-display the item.
If you would delete the content element instead, not only would you be operating under the time constraints of recovering the content, but you would have the hassle of un-deleting it.
Hiding too much content?
Don't go too far overboard hiding contents. It may become difficult to sort through the backend to keep track of which pages and elements are visible and which are hidden if you leave too many hidden ones around. If you don't think you'll need it again, you can just delete it instead.