Move a message to another mailbox: Select a message, click the “Move to” button mailbox.
Show messages from several mailboxes: In the Mail sidebar, select multiple mailboxes.
Show messages from a specific email account: Click the arrow on your Mac, do any of the following:
Make text larger by pressing Command-Plus Sign (+) until the text is large enough for you. To make it smaller, press Command-hyphen (-).
Use a light or dark appearance on Mac