How do we switch our application from "Available on the App Store and for volume purchasing" strictly to "Available ONLY for private distribution to specific..."

We have an approved application whose Availabilty was initially set to:
"Available on the App Store and for volume purchasing on Apple Business Manager and Apple School Manager"
We need to switch it to:
"Available for private distribution to specific organizations on Apple Business Manager or Apple School Manager"
What steps do we need to take in order to accomplish this?