[Psi-Devel] How does "Bookmarked conferences" in psi 0.12-RC1 works?

[z]

In an announcement was mentioned some "Bookmarked conferences"

"Bookmarked conferences.
MUCs/groupchats can now be bookmarked (subject to server support, which
almost every server has), so the user interface provides quick access to
favourite mucs, and also to autojoin settings at login time."

But i've found no changes in UI to deal with this new feature...
Can someone tell, what is this and how it works?
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