Hey Henri,
Unfortunately currently that was not possible to configure to show some certain field for admin only, because those custom field is based on the current user privacy, if the user privacy set those `Textbox` custom field to "Only Me" privacy, this field will only appear to himself only.
I've checked on your current profile type custom field, it seems like there got a few custom field was used to Textbox field, example :
- Mobile phone
- College and university
- Graduation year
If you set that textbox custom field privacy from ES backend -> users -> profile types -> select your profile type -> privacy -> set "Who can view my textbox field" to "Only Me", mean all the existing textbox custom field will automatically set to "Only Me" privacy.
If you only want to set "Mobile phone" custom field to "Only Me" privacy, i would suggest you change these "College and university" and "Graduation year" field type to other, so that privacy changes only will affected for this "Mobile phone" custom field only.
Hope this will help.
By the way, thanks for sharing Sabih