Screen Setup: one main display and two extended. How can I do this?

[RoboticSkink71]

I'm not able to include a 3rd computer screen on my setup. I'm able to extend 2 and 3, but not see anything on 1 and the computer will not allow me to include 1 as a "second VIEW." I say VIEW in caps as I'm happy having the option to have one screen extended, but I would like to be able to see a third with a different setup entirely. This makes it much easier to do detailed work, e.g., copy data from excel to another spreadsheet, etc.

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