How to restart KDE Plasma Desktop without rebooting or closing the session
If your KDE Plasma Desktop has frozen and won’t respond to anything you do, don’t worry, there’s a very easy way to restart it and unfreeze it without having to reboot the computer or closing and re-opening the session.
Simply do CTLR + ALT + T to open a terminal, and then kill KDE Plasma:
killall plasmashell
And restart it:
plasmashell &
It couldn’t be any simpler.