BuddyPress.org

Usually when new user join a public group, everyone else(member or not member of that group) can see the “Join Stream” of it. I want this also works for private group. What do I mean, when new user join a private group, everyone else(member or not member of that group) can see the “Join Stream” of it.

Note that I just want to show the “Join Stream” like user joined the group privateGroupname

Is that possible? How can I make it possible?
Help me please?

thanks