Not having all the chats available in the left margin is a downgrade from the old way. I know we can start a "new message" to find the other chats, but it would be nice to just be able to sort by name or most recent to find things.
Some chats are meant for internal communication for specific groups/clubs/teams at work, and others are for project chats. It would be really helpful to be able to move non-project related chats to the top (or bottom, depending), and have similar projects stacked on top of each other. Right now, there doesn't seem to be any alphabetization or pattern in how they fall in the list.