Mail (El Capitan): Mail sidebar
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The Mail sidebar lists mailboxes, folders, and flagged items for the email accounts you’re using in Mail.
If you don’t see an expected email account in the sidebar, choose Mail > Preferences, click Accounts, then make sure the account is enabled.

- Show or hide the sidebar:Click Mailboxes in the Favorites bar, or choose View > Show Mailbox List or View > Hide Mailbox List.
- Resize the sidebar:Drag the sidebar’s separator bar left or right. If you drag it all the way to the left, the sidebar is hidden.
- Adjust the size of icons in the sidebar:Choose Apple menu > System Preferences, click General, then select a sidebar icon size.
Last Modified: Jan 22, 2016