From most of the order management tabs, you will have a link to go to the Order Details screen. This is where you can view a detailed summary of the order as well as perform many order management and editing functions. The exact functions you will have access to will depend on your admin permissions.
At the top of the invoice you’ll find navigation links. These allow you to go to the next invoice on the list of orders, back to the previous one, or to return to the list of orders. This allows for quick review of a number of orders. You’ll also see the Order Number and Date.