I have a laptop and a docking station connected to 2 monitors. If I have the laptop docked, and use the monitors, I have a panel configured on each monitor with the app launcher on the left of the left panel, and the system tray and clock on the right of the right panel. 

When I undock to only have a single monitor, I get the primary display's panel with the app launcher, but now don't have the system tray (making wireless rather inconvenient). 

It would be handy to be able to setup different plasma profiles of panel layouts for single and multi monitor use cases. 


P.S. In 2013 Daniel mentioned something about multiple display profiles. Not sure if it's related. 
https://bugs.kde.org/show_bug.cgi?id=324393

Reproducible: Always