webcasebv
This 'All Events' option means that this field will be automatically enabled for all events - this meant to new field you create.
If you're already enabled this field in events, and you set this 'All Events' to No, this field is not be affected in event, it's still being enabled.
That's why I suggest that if you edit a field, pls set this option (All Events) to No.
I hope it makes senses.