31-01-2017, 10:42 PM
It seems your FSX resolution may not be set to the same as your monitor resolution. Go to Start, Control Panel and then Display. See if your monitor is set to it's native resolution. If not, set it correctly then make sure the resolution set within FSX is the same. Or, it could be the DPI is not set correctly as well.
See FsPassengers Frequently Asked Questions: FAQ