Mailbox list has disappeared
I have a MacBook Pro M2, MacOS 13.5.1.
Now when I run Mail, I do not see a list of mailboxes (inboxes, Sent, Junk, Trash, Archive etc).
How can I make the mailbox list appear?
MacBook Pro (M2 Pro, 2023)
Are these mailboxes "on My Mac" or the Favorites? In either case look for the > button to the right of the section title and click on it: