With the frippery static monitors extension I managed to enable the workspace switching for second screen. It is no longer static, which imho makes no sense at all, at least not per default ...

One remaining issue is, that the workspace switcher is only shown on the primary monitor. So it is not possible to move one window from screen 2/workspace 1 to screen 2 workspace 4.

I have to move it to screen 1/workspace 4, switch to that workspace and then move it to the second screen.

Crazy!

My perfect setup, clone the top panel and the workspace switcher to all other monitors, showing the windows that are on the corresponding screen.
(See the screenshot)

If i search for apps in activty view the app list should only be shown on the primary screen though.