Well, PopOS is a distribution, based on Ubuntu, shipping a desktop. That desktop was formerly a customized GNOME, now they have their completely own desktop environment.
The tiling might be similar between both but their GNOME extension is probably deprecated now.
Cosmic has dynamic tiling, while KDE has many manual tiling features which may be less efficient but require nearly no setup.












Where does this work? I even tried the lemmy WebUI and didnt find such a feature