Ability to hide Security Level field from users who cannot edit it

Hello

We have a project with various security levels corresponding to different customer groups. This works well for use, but we would like the security level to not be visible to those who do not have the permission to edit it (i.e. the external users). I have used the Set Security Level Permission to ensure that only internal users can edit it, I have added the Security Level to the edit screen for the project/screen scheme, but not to the View screen. However the Security Level still appears in the View screen as seen, both by internal users and external users. Surely it should now only be seen in the edit screen, and then only by those with the permission to edit it?

Any help gratefully received.

many thanks

David