JimmXinu, I hope my previous post (#1076) describes ‘how I got there’ (i.e. how I screwed up Reading List).
I don’t know why it is wildly dangerous for me to edit the .plist file. I suppose if I entered some garbage file name, something strange might happen, but I proceeded fearlessly.
Of course, I did use the GUI initially, but after I screwed things up by deleting “Default”, and after then uninstalling Reading List, then reinstalling it, and still not be able to use the GUI to configure Reading List, it was quite reasonable to avoid the GUI and edit the .plist file, IMO.
If you want, I can try to first duplicate the problem, and then I can update Reading List and repeat what I did and confirm I no longer need to “edit the .plist file. I’ll proceed now and will post my results…