LG Screen Split

[sofierce]

Hey folks, I bought an LG 43UD79-B after watching the video LTT made showing off Synergy 2 and using 4 OSs on one screen. Hoping someone has a solution to an issue I'm having while I wait for LG CS to get back to me. Their website advertises the ability to split one 1920x2160p on one side and two 1920x1080s on the other. Unfortunately I realize now that it is only through the onscreen control software, and not the monitor itself. Instead of displaying 3 inputs, it splits one input into 3 onscreen boundaries. This doesn't really work for me, as I'd like to run multiple systems and be able to fullscreen programs. Fullscreening something while using the software takes over the entire display instead of the region, and snapping programs into the regions leaves random gaps around the edges. Any ideas on non jank ways to accomplish this? Screenshot attached of the end goal (minus full screening)

 

Really hoping I don't have to run four way split and drag something down across one side, but I guess it would work if all else fails...