This site is being deprecated.
Please see the official X‑Plane Support page for help.
None of the default aircraft are equipped with a 2d panel in X-Plane 11. So you would need to use an aircraft that comes with one (most likely older aircraft designed for the older version of X-Plane). If the plane comes with a 2d panel that isn't displaying, you can file a bug here. Be as specific as possible about the exact plane & all the steps you take to see the issue.
This site is no longer being actively maintained.