What I do is to add books to an Intake library and use the Find Duplicates>Library duplicates to look for duplicates in my Books library. If there is a duplicate (rare for me), I can look at what I have in the Books library via the Calibre Spy plugin.
Apart from that, I do metadata editing, conversions, etc while the book is in the Intake library, when that's done I move it to the Books library.
BR
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