Just putting out there use the Ctrl-Win-Left/Right shortcuts rather than the mouse, and you’ll find much more convenience out of it. (Ctrl Alt left/right for many Linux desktops)

I use it all the time on Linux since forever, and with W11 at work…

It’s to separate different uses, say have a gaming space, productivity space, background messaging/email/communication. You can shove anything that you’d want running but not in front of you away, while still being able to quickly access it.

At work I do multiple projects, so I can have Project A related folders and programs open on one workspace, with Project B stuff on another, letting me switch between. If someone calls me about project B while I was working on A, I can quickly switch over, rather than closing my current stuff, or just leaving it all open and fumbling with alt tab.