Setting up project to dual screen

Hi, I have an already existing uproject that I want to display on two screens (each screen uses half of the project’s screen size and in total the view is only one screen).
The solution that I came up with is to use nDisplay. I tried using it as a plugin for the already existing project but it turned out I need the switchboard to start it. I tried then to create a new nDisplay project and migrate everything but I always run into problems.
How should I proceed to fix the issue, or which solution should I choose?
Any help, solution or suggestion would be really nice to have