In Settings > Mailboxes, add the ability to edit the order of the mailboxes, & then display them in that order in the top left-hand corner.
In Settings > Mailboxes, add the ability to edit the order of the mailboxes, & then display them in the edited order in the top left-hand corner on the main page (that has the Inbox).
1st
ranked

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Jessica Stewart commented
Great minds think alike! With all of the current customization options, you would think this one would be a no brainer! There isn't even a help topic on it!