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#31
On my PC, that is running 3 screens. The monitor I set as main display is the one that stays on when I select PC Only. If I change what screen is the main display, that screen becomes the one that stays on. The numbers have nothing to do with it. I've done this several times, the results are the same each time.
The screen numbers I get for each monitor depend on how many monitors I have connected and what ports I have them connected to. I can't change what number they get from Windows.