Thanks for bringing this up, @madelonw. I've had the same situation for years, but have been too lazy to fix it until now.
When I first started using Calibre, for some reason I made another Formats column (#formats) and stuffed it in there, and in the tag browser. No idea anymore why I did it, but it's been mildly in the way ever since.
Preferences-->Look and Feel-->Book Details to get remove it, as DNSB said.
Preferences-->Add Your Own Columns to get rid of it completely.
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