Your new, single inbox allows you to view all of your notifications in one place. New messages in conversations assigned to you, conversations assigned to a list you're a member of, or any new mentions.
The label next to the patient's name will let you know which list the message is under. And all mentions will appear in yellow.
To view each list individually, or to look at other lists that you are not subscribed to, you can click on the "My Inbox" dropdown: