Hi! I saw on Youtube, Stackoverflow and blogs that `xrandr --setmonitor` can be used to split a ultra wide monitor into two/three virtual ones. Kwin seems to don't support that option. Is that possible in newer Kwin versions (I'm on 5.20.5 from Debian Testing)? Is there a way for me to help implement that?

Hi,
I would love to see this feature too!
I have an ultrawide 49" (ratio 32:9) display on my desk and at the moment I use the Picture-by-Picture feature of the display an connect it with the USB-C and DP cable to my docking station. To the system the display looks like two single 27" 16:9 displays with a resolution of 2560x1440 but without a bezel between them. In this way I can place windows with the snapping function only on the left or on the right screen, but I would prefer to also have a 3 area layout equally tiled or with area ratios of 9:9/14:9/9:9. All available tiling or snapping scripts have the downside, that if you maximize a window to fullscreen it is really fullscreen, whis is usually not what you want. In my PBP setup I can have a youtube video or my VMPlayer running fullscreen on one side while the other windows can still be placed freely on the other one. Ultimate function would be a full integration into the virtual desktop setup to be able to define different virtual display configurations for each virtual desktop. Unfortunately I have no idea how to implement this in kwin

I have am doing exactly your workaround: mine is a G9 from Smasung, so it's ultra wide and has a split in half PIP mode that I am using.

What I did as a workaround for using Teams to present was to create a Xnest virtual session, so I could "share the whole screen" but the screen was actually a window.