ROAMING is only where the CONFIGURATION (normally) IS. This is where Calibre stores info ABOUT known Libraries. You may need to just re-link these
Libraries are usually in normal User areas like Documents.
Libraries ALWAYS have
metadata.db in their base folder.
THAT IS WHERE you create/Switch: USE EXISTING: <point to there>
Repeat for EACH LIBRARY LOCATION
If there is NO METADATA.DB, report back for alternate ways before you make things REALLY HARDER