Zombie desktop artifact

Hello NMGLUG,

I've got a two-day old install of Debian 10 with KDE Plasma desktop on a 
brand-new 1TB SSD in a two or three year old 15" HP-Notebook with an AMD 
CPU.  This installed via Calamares running from a live, non-free 
firmware iso, checksum and signature file verified.

Mostly so far everything seems robust and beautiful, but there's been 
considerable pathology with setting up the panels the way I like.

Right-clicking on an application in either of the main application menus 
(I have a cascading menu in the upper panel, and the default menu in the 
lower panel) *should* show and permit the option of installing a 
one-click launch icon on the associated panel--but sometimes it does, 
and other times it doesn't.

Also, I had a dictionary widget in the upper panel that was apparently 
missing one of the supporting files for some reason. In association with 
a desktop crash, hard powerdown* and/or my eventual removal of the 
widget, the error message somehow became permanent.  See attached 
screenshot.

Any suggestions for how I might best attempt to repair this?

Thanks,

Tom

*'ctrl-alt-esc' will kill Plasma (but leave application windows running, 
presumably because they run in different threads) but I don't yet know 
how to restart Plasma from the terminal, and for some reason there is no 
'shutdown', 'reboot' or 'halt' command installed.

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