@melevolence: There are a number of issues in your answer here, some of them triggering the harsh responses. So I try to summarize them here:
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Your answer is actually about a different issue, only distantly related to the original question. OP has asked for a feature to save space in comment’s area - and the question didn’t actually require to remove sensitive data from the document, only to collapse the unnecessarily used space where it could be used with more value to OP. It’s even not obvious that OP actually has any sensitive info there - it might happen well that OP doesn’t have personal data filled, and so only has that generic “Unknown author” text with date, which is also not needed in OP’s case. But you are talking about anonymizing document.
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You use
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for what is not an answer on an Ask site - i.e., it doesn’t allow OP to solve the problem. This is not a forum - and it’s meant to have a question and answers each aiming to solve it.