Thanks everyone. I succeeded, but in a roundabout way, it seems.
I probably did not originally create the new library properly.
I exported Library 2 from an old computer, "created" a second libarary on my new computer, just by making a new folder in Windows in the default directory (same directory where my original library was), and imported.
When I wrote here, I was trying to figure out how to copy from Lib 2 to "Lib 1."
I was not able to add the command to the main toolbar, but I could add it to a different menu/bar, which I did, and it worked.
I don't know about the "quick switch list."
If someone else uses this thread for help, they can probably figure it out.
