nDisplay SDI Media Output?

I can’t find anywhere the actual process to get the SDI out to the wall!
I see a you can Media Output (to our BM Decklink 8K)
from
Node_0(Primary)
or VP_0 for example.
Neither of these gives us the display with the rendering Frustrum, but rather a static flat front view.

Can someone point me to the answer of the documentation that covers getting the correct video out of nDisplay?

Thank you!