Remove metadata in font info

Some fields on font info can’t be removed, others the minus icon appears. What’s the way to do so?
Thanks

That means that the field is mandatory.

Yes I understand that but when I create a new file, there isn’t that field by default.

I see. For fields where there is a “+”, hold Option, then the + will turn into a −. Alternatively, you can select the field and press Command+Backspace.

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Aha! Great. Thanks for the tip.