I want to modifed ALL JVB parallely communicate when joining jitsi MEMBERS

I have 1 JMS and 2 Extenal 2 JVB (Total 3 JVB)

But now by default setting.
When joining different Jisti Group
It work parallely joined to the all JVB.

I want to modifed that.
When joining the jitsi MEMBERS parallely connect all JVB.