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dmcurator - like you I switch between libraries quite a lot. I have Quick Switch at the top of my Favourites (optional plugin) list, which is at the top of my context menus
The Favourites plugin allows the user to cherry-pick individual options from individual Action items - it's one of the lesser knows calibre gems.
Aside: I don't need to switch as much since the CalibreSpy plugin came into being last year. With it you can concurrently view multiple libraries on a Read-Only basis alongside the regular calibre library manager.
BR