Kovid, I suspect the OP's problem is that they sometimes inadvertently click on the next option, "Remove all formats from selected books", AND at some time in the past they suppressed its "Are you sure" pop-up - result: all the formats get deleted.
My recommendation to fallible users is don't suppress "Are You Sure" popups, especially on destructive operations like remove options.
BR
Last edited by BetterRed; 02-06-2020 at 01:33 AM.
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