I got responsibility for another SF instance. The objects all have 100's of fields, of which many are hidden from all users (historically, they would not delete the field, but hide it from all users - great practice IMO)
Now, comes the time, we can delete these fields. but going through them is very time consuming.
Any idea how I can get a report/list/rest of all the fields that are hidden from all profiles ? FLS settings offcourse.