I think my fix was more good luck than good judgement! However I will try to explain. When I first tried this I could not find all my "sub-libraries)
1. Click on your main library then select first option "Switch/Create Library"
2. Under "Choose your Calibre Library - New Location - select the icon at far right and hopefully you can find your missing sub-library - select it.
3. Leave the "Use the previously existing library at the new location" then OK
This is how found my "lost" libraries
Mitch13
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