You can display your emails grouped under different tabs. Panel Tabs are based on Split Panels and you can choose your own tab groups. You can get more information about editing split panels here. View

You can choose Panel Tabs when viewing email folders. Tap on the action menu (circle with 3 dots button) in the inbox or email folder view. Tap on 'Panel Tabs' and then choose a saved split panel to change the email list layout. This will display named tabs along the top of the email list.