Resetting KDE’s display configuration

Recently, when connecting an external monitor to my laptop, KDE turned off both displays, which sometimes even endured when disconnecting the monitor. Resetting the display configuration on the command line helped: Before plugging in the video cable, I opened a terminal and typed the following command:

After both screens had become black, I pressed Enter and the desktop re-appeared on the laptop screen and I could continue configuring with the regular Display Configuration:

 

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