Missing “All Mailboxes”
Suddenly my All Mailboxes in mail is gone on Mac running Big Sur. How do I get it back? I’ve tried a force quit and restart. My mail is in five mailboxes.
MacBook Air (2020 or later)
Mailboxes missing?
Make sure they are not hidden.
Launch Mail app.
Show sidebar.
Move mouse pointer to the far right of “Favorites”.
A forward pointing arrow tip (Show) will appear.
Click it. Arrow (chevron) will turn downward showing mail boxes.
https://support.apple.com/guide/mail/use-favorite-mailboxes-mlhl6e39ca4a/mac
If the problem persists, you may need to rebuild a mailbox.
