Here's what I did:
* Invoked System Settings -> Workspace Behavior -> Virtual Desktops
* Set the name of a desktop to null using the pen and backspace key
* Hit Apply
The system is now well and truly locked up; the best way out seems to
be a reboot.
System is:
Operating System: Fedora Linux 36
KDE Plasma Version: 5.24.5
KDE Frameworks Version: 5.93.0
Qt Version: 5.15.3
Kernel Version: 5.17.13-300.fc36.x86_64 (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-4790K CPU @ 4.00GHz
Memory: 15.4 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 4600
--
Sincerely Jonathan Ryshpan <jonrysh(a)pacbell.net> For I am a Bear of
Very Little Brain, and long words bother me. -- Winnie the Pooh