I have no idea. I just dipped my toes into KDE again this weekend. This isn't going to sound good for Gnome but a gdm3 update on debian sid broke it. Needed a desktop so i tried KDE again. Everything i can find seems to indicate I should be able to switch desktops by holding super and scrolling or hitting a number but i can't. I can get to workspaces if i move cursor to top left. Though those might be something called "activites" since they are sandboxes from each other.
Other than that I have KDE on steamdeck and "steam machine" connected to tv and its fine because i rarely use it for anything other than web browsing anything else I need to do on those are more easily done via ssh. I've never attempted to use workspaces on either since they are more gaming/video devices for me.
Thanks!