Chats and Rooms both appear in the "Chats" tab at the bottom of the app.  

Group Chats that are not Rooms will now appear alongside your 1-on-1 private Chats in the "Private" tab of "My Chats."  All chats, individual or group, that appear in this tab are Private by default.

Rooms, will appear in the "Rooms" tab of "My Chats."  Rooms will appear in this tab regardless of their online or offline status or their privacy settings.  The status of each of your Rooms will be easily visible in the "Rooms" tab; offline Rooms will be darkened and marked with the word "Offline"