highlighting already cited items

Hi!
Is there a way to quickly find out which documents (articles, books, etc) from the Zotero library have already been cited in a work in progress? For example, someone who is writing a thesis and wants to quickly know which documents from the huge list of those already collected have already been cited in the word file being written. Of course there is the manual way - simply generate the list of references in the Word file and compare one by one with the Zotero items, but I would like to know if there is a simpler way that highlights the files.
Thanks!
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