Guardians can't see the contact details of other guardians. This is the same for all guardians, not just those who are separated or where there is a court order.
In this example, both guardians live with the student. Max cannot see Paricia's details, but he can see Poppy's details as he lives at the same address.
If the child lives at the same address as one guardian but not the other, the other guardian would also not be able to see the student's address. In this example, Faye is logged in.