Splitting 21:9 to function as 2 monitors with wow?

Is there away to play wow on a 32:9 screen in fullscreen windowed, but as 16:9 resolution, with a 3rd party app that would split the monitor to function as 2 separate monitors?

Can’t really stream 21:9 or 32:9 gameplay very well, lose a lot of real estate, functionality of another monitor like having chrome on the side monitor.

I don’t wanna do “windowed” mode because the mouse would not snap properly to wow and wow would easily accidentally be dragged. Fullscreen windowed is fine, but doing this seems to make it stretch across the entire 21:9 or 32:9 resolution.

Hmmmm…