This site is being deprecated.
Please see the official X‑Plane Support page for help.
In X-Plane 10, if you only have one computer, multiple monitors will only display one very large screen, or two screens (the IOS and cockpit). There isn't a way to set up extra monitors as other views unless you have more than one computer running X-Plane as far as I know.
Some people have had luck with the videos from X-Force PC for this issue though.
This site is no longer being actively maintained.