Mail sidebar

The Mail sidebar lists mailboxes, folders, and flagged items for the email accounts you use in Mail and your favorite mailboxes. If the sidebar isn’t shown, choose View > Show Sidebar, or press Control-Command-S. If an expected email account isn’t listed in the sidebar, choose Mail > Preferences, click Accounts, click Account Information, then make sure the account is enabled.

To increase the size of icons and text in the Mail sidebar, choose Apple menu > System Preferences, click General , then choose a size from the “Sidebar icon size” pop-up menu.