Making portal with specified instance and accessibility (Invite Only, Friends, ...) is one of the major purpose of VRC_WebPanel that we lost.

It was very useful for some events hold in VRChat. With this, event moderator could easily control fllow of guests without manual invite operation (or becoming friend of moderator to join).

Related : https://vrchat.canny.io/feature-requests/p/vrcportalmarker-set-room-type