What is a Profile Invisible Field?
Profile Invisible Fields are the mix of CRM Default Fields and Custom Fields that an account admin has not visible via Profile Field Level Permissions.
Where does an admin user enable fields to be Profile Invisible?
On the Profile that is assigned to a user.
There are fields that are active, but a user can’t see them. What’s wrong?
Most likely it’s due to the profile that the user has been assigned. Check the field level permissions of the user’s profile.