Mail folders and labels help you better organize your messages so they’re easier to find. When it’s time to get your email labels and folders in order, use the Inboxes list in iOS Mail. Learn how to add a mailbox or folder to a shortcuts list and how to rearrange items in the shortcuts list with iOS 12 or later.
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To add a mailbox or folder to the Inboxes shortcut in iOS Mail, follow these steps:
On your iPhone's home screen, tap the Mail app.
Go to the Inboxes menu. (Swipe from left to right until the list of inboxes is visible.)