User's Guide - Project Bar
The Pages tab of the Project Bar lists all of the pages in the current project.
Whenever you add a page to the project, the page's name is added to the list on the Pages tab.
Pages can be moved in your project by dragging them from one position to another in the list.
Moving a page doesn't change the page itself; it simply adjusts the internal order of the pages in your project. In other words, it only affects things like the built-in variable %PageNext% (which sees all the pages in your project as one long list).
You can switch to any page in the list by double-clicking on it. When you double-click on a page, it becomes the current page and is shown in the design window. (This is the same as clicking on the page tab for that page at the bottom of the design window.)
You can also right-click on a page in the list to perform a function from the context menu. For example, by right-clicking on the Pages tab you can:
Add a page
Delete a page
Rename a page
Cut or copy a page
Paste a page before or after the current page
Export a page
Import a page
Preview a page
View the properties of a page