Add Library button provides the function literally what it says on the button name, which is basically right; but not remove (uncheck) library.
Actually rather than that, an auto-complete search text for browsing block objects might be handy. Well again I’m not sure to what extended would the block objects library go, may be considered in the future when the library grows big..
Thanks for this. Yes, we are planning to add categorisation for libraries, but a remove option would be sensible. Added to backlog
voted for by @Krisz