[haertig]

The symlink works for my purposes. I misspoke when I previously said "or hardlink". You can't create a hardlink to a directory. I typed before my brain was engaged when I mentioned hardlink.

There is one minor glitch in this symlink workaround. When you initially start up Calibre, it indeed opens the desired library now. And you can see in the first attached screenshot below that all the libraries have their correct names (I have more libraries than just "Novels" and "Reference", but I only mentioned those two earlier to make things simpler). But once I choose a different library - Calibre successfully changes to that other library - then you can see in the Quick Switch listing that your current library has taken on the name of "CalibreLibrary" rather than it's true name. As you switch between other libraries, the "CalibreLibrary" moniker moves around to point to the current library (and the original name of the previous library is restored). This is a minor glitch that I can live with. It's easy to tell which library I am in just by looking at the book covers.

Thanks for your help!