Not able to make a custom field mandatory in Redwood page

For External Supplier Registration, in verification page, we have added couple of custom columns which are marked as mandatory. But even then , user is able to move ahead to new page using just the seeded fields on page. How can we restrict user to move to next page unless required custom fields are provided data with?

In the attached picture, left hand side fields are custom, while right hand side there are seeded fields.