X-Plane no longer recognizes my Main Monitor

Question

When I first loaded x-plane 11, it ran fine in my main monitor.  When experimenting with the settings, I changed to "Monitor 1" (the 2d monitor) and Full screen, x-plane stopped recognizing my Main Monitor and will ONLY run on my 2d monitor.  How do I get x-plane to return to my Main Monitor?

Answer 1

You will need to reset the monitor configuration in settings. As a last ditch option, if you don't remember how it was configured before, you can completely reset your preferences to get the same settings as when you first launched X-Plane.

Move the preferences folder (found in the Output folder) to the desktop, then restart X‑Plane and default preferences will be restored. If the default preferences do not fix your problem, you can simply replace them with the folder you moved to the desktop and restore your personalized settings.

Answer 2

I second what jroberts said, OR, you can keep most preferences and only delete or rename just the two video related preference files: "X-Plane Screen Res.prf" & "X-Plane Window Positions.prf".

Comments

Thank you - between your identification of the files and jroberts' pointing out the correct folder, I was able to modify (a copy of) the .prf file and all is working again!

Is X-plane's counter zero-based?  It states "number of monitors: 1", yet the main monitor is "0".

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Correct, first monitor is index zero.  In a four monitor system they'd be zero to three.  And, just to keep things interesting, I believe the primary monitor (the one with XPlane menus) is always monitor zero.