Adding inbox icon to mail toolbar.
Since the last update on my MacBook Pro, I cannot add the inbox icon to the Mail toolbar for my two accounts. It forces me to scroll up and down my mailboxes, which is very frustrating.
MacBook, macOS 10.13
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Make sure Favorites bar is showing.
Mail > View > “Show Favorites Bar”(at the bottom of the dropdown.
Section: Add a mailbox to Favorites
For details:
https://support.apple.com/guide/mail/use-favorite-mailboxes-mlhl6e39ca4a/mac