3 monitors, 2 combined and 1 mirrors the first, really?

Question

Iron

Is it possible with three monitors to make 2 extending each other, and the third one would mirror the first one? Or is this impossible to implement?

Answer 1

Connect everything, define it, and then set the assignments for each display through the screen settings.
1 is Primary, 2 is Extend 1, and 3 is Duplicate Display 1
Should work if you have the ability to support 3 displays.

Answer 2

video splitter.