If you have more than one e-mail account on your iPhone, you may want to change the order they appear in the list. You can also add additional folders to the list that appears at the top of the page. This process is shown using iOS 11.
After creating desktop and/or keyboard shortcuts for applications or shortcuts, to open a folder or new e-mail, your desktop can become cluttered. Creating a folder to hold all of your shortcuts can help to clean up your desktop and stay organized.