When you click on a page in the sitemap, you can see several menu items to change anything about a page. Properties, Set Permissions, Design, Versions, Delete, and Add Page are also visible in the toolbar of the in-site editing mode. You'll see the same dialog, no matter where you've opened it. Please note: Add Page will only be visible when you're looking at a page without editing it, while the rest will be available when you actually edit a page.
The following are the items present in the menu:
Visit: Opens the selected page.
Properties: Shows a dialog where you can edit the values you enter when you create a new page. Change page title and description, manage custom properties, and set aliases for a page if you want the page to appear at different URLs.
Set Permissions: Manages the access to the page. More about this in the next chapter.
Design: Changes the template or theme for the page.
Versions: You want to see how the page looked in the past? Versions shows you every page...