MacOS has a built in 4x4 window tiling which works for this purpose for me. I don’t find ever wanting more than 4 windows open on an ultrawide. Definitely not as powerful as something like xmonad but useful for the majority of my use cases.

Windows also has this kind of tiling built-in. It even comes with default keyboard shortcuts.

So does Mac: https://support.apple.com/en-us/guide/mac-help/mchl9674d0b0/....

Obnoxiously, it's part of the recent trend of overloading the Globe/Fn key, so it's hard to do with third-party keyboards.

Can you not change the shortcut?

Here to say ubuntu's got it built in as well