I'm looking for a solution to split a large or widescreen monitor in multiple screens. The picture-in-picture mode works, but I'd like to have the screens as one panel instead of having the window frame/chrome.

Ideally it would also disable the screen it's on. My use case is that window management is better with multiple monitors. The other is that instead of multiple monitors, I'd love to just buy a single large TV instead.

If possible, it should be easy to change the aspectratio / display sizes by simply dragging the line where two displays meet