Turn off a display while training

I've installed the ION EOS Software on a Windows 10 system to start training.  When I open in Offline mode (or other) it uses both displays on this system.  I would like to turn one of them off so that I can read documentation or watch videos on one screen while working on the other.  There's a setting for number of displays that I set to '1' but that doesn't seem to have any impact.  And I can't just close a window.  Is there a way to limit EOS to one display?

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