When I activate the overview in plasma6 by moving my mouse to the upper corner there are no previews of the running applications. Previews are generated for task switcher and the toolbar. I know this was working at some point, so I thought I had done something in the settings, but I added a new user, logged in with plasma, and have the same problem.
Thanks in advance for any ideas. (The irony is that this feature convinced me to switch from Gnome lol…)