You can open multiple views at the same time with one OR two monitiors.
To get multiple views:
1 – Close all views except for Model View.
2 – Right click ‘Model View’ in bottom left and select ‘Add New Model View’
3 – Go up top and select ‘Window’ then Cascade or Tile option.
4 – You now have two windows that can be assigned to 3D and 2D , sized / arranged and controlled by View Filter , independently.
Best use is when you need to ‘see’ in 3D what you are doing in 2D.