New chat
In the top menu the top-right icon button starts a new chat. After clicking it the current chat is saved in history.
History
In the top menu, the second button from the right toggles the history drawer. The history drawer lists your historical chats. The chats are ordered chronologically with time labels like "Today", "Previous 7 days", etc.
Message Menu
User messages
Voice input
Dictate your message instead of typing it. The mic button (Voice input) sits in the chat input's bottom-left icon row, next to the attachment and screenshot buttons.