To reorder your navigation items, click on Base Folder (or whatever subfolder you need to reorder). The information displayed on the View tab will often be in alphabetical order. The Order column tells you which order your folders and pages are currently in. If you click on the word Order, the column will reorder in numerical order. Use the arrows in the Actions column on the right to change the order. Lower ordered items will appear before higher ordered items in both the top and side navigation.
The order in the above image will place the folders in the following order:
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