This article explains how to switch between the classic and new Client Area interfaces. You can toggle between them at any time, depending on your preference.
Switching from the Classic to the New Client Area
Log in to your Client Area
Click on My Settings (top right corner)
Click Try New Interface (Beta)
Your interface will update to the new layout
Switching from the New to the Classic Client Area
Log in to your Client Area
Click on the menu arrow next to your profile name
Select Go to Classic Interface
Your interface will revert to the classic layout