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I have just begun using the GTN 750 in P3D 3.3. When I pop the window in the VC, the aspect ratio, I think follows the monitor(?) and it is too narrow. So each time I start the sim I have to go through and resize it...and place it. Is there a config file somewhere that I can specify the size and placement or at least save it? My understanding is that, unlike XPlane, P3D saves the windows/size/place to the scenario not the aircraft?

So I took my own advice. Set up the window placement and size to how you like them then save the scenario in P3D and make it favorite and default. The next time you start P3D and load that default scenario, all the windows will be open, the right size and in the correct position. Hope that helps someone else.