[doublepost=1480110996][/doublepost]With 3 screens choose your main and secondry monitor, move the control banner to the one you want to be secondary, launch fcp then move the fcpx interface to the what will be your main screen from what will be your secondary, (fcp x launches onto the control screen with the banner) when you select show in secondary in fcpx the screen with the banner will be your secondary, (the macs main!!). The 3rd screen so long as it is set to show 1080p or whatever you are editing at will display pure video out and is selected in playback preferences. If your project is set to something the third monitor can't display natively it will not be selectable. Its a bit of messing about and 1 becomes 2- 2 becomes 1 nonsense but it does work. Sure it could be easier somehow! 10.3 has helped a bit, but only in giving a few more options for confusion.
Did you ever solve this? I'm losing my mind over here with 3 monitors. I just want to be able to move the viewer to a different monitor than the one it keeps defaulting to when I choose to view the viewers on a secondary display.
