This site is being deprecated.
Please see the official X‑Plane Support page for help.
Green boxes help you to see what buttons, knobs or switches in the cockpit are interactive. During the flight you can turn it off by going to View > Show Instrument Click Regions. You can try the demo. The full version of the simulator will perform exactly the same as the demo - neither better nor worse. You can also read more about X-Plane 11 System Requirements here.
This site is no longer being actively maintained.