Multiple monitors, full screen, and I am running XPlane in Monitor 1 while my Main Monitor is "unused." When I enable Main Monitor for XPlane, the SR22 Aircraft Window appears as expected, though on the Main Monitor even if it is showing IOS. But when Main Monitor is not used, it can not be seen or accessed.
So, that's a sufficient work around. Expected behavior would be if Main Monitor is not being used, for it to appear only on an enabled monitor.
Thank you