In Wired Plus, default fields can be public or private.
The privacy settings of a default field will determine if it's shown on the preference centre.
A field that is public is visible on the preference centre.
A field that is private is not visible on the preference centre.
How to edit the privacy settings of a default field
On the main navigation bar, hover over 'Subscribers' and select 'Custom Fields' from the dropdown.
Click on the 'Default Fields' tab.
In the 'Visibile' column, select the toggles of the fields you want to appear on the preference centre. Deselect the toggles of any fields that you don't want to appear.