How to clear contents in some field in one time?
For some reason, I want to to clear all contents in 'Extra'. Are there any methods to achieve it?
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I would recommend leaving Extra alone here—it’s used to store some important data sometimes (e.g., DOI names for book chapters). It’s possible to clear Extra for all items, and I could walk you through that if you want, but I’d advise against it in this case.