My question is similar to the one asked by mariekes on 04-18-2020, 08:47 PM.
Where is the list of previously searched libraries stored?
The directories shown in the drop down list have no connection with calibre's 'master' library list and appear to be stored in a separate file used by this plug in.
The image below shows a list of 6 directories which include 2 non-existent (phantom) directories.
I have tried uninstalling the plugin, restarting calibre and reinstalling the plugin, but the phantoms directories are still there.
TIA
Dave