Gilad says “The new inbox is easy to customize – select the tabs you want from all five to none, simply drag-and-drop to move messages between tabs, you can set some senders to always appear in a particular tab and star messages. It also appear in the Primary tab,”
If you don’t like the new style, switch off all optional tabs, and you can use classic view.
In the next few weeks the new inbox is rolling out across desktop and mobile apps.