[Siddharth Rohra]

Premiere Pro CS6 – Redesigned, customizable user interface
New default workspace
Premiere Pro CS6 has a new default editing workspace with larger Source and Program monitors (a configuration referred to as “2-up”). This view allows you to view high-definition video much more easily in this workspace.
To return to the standard editing workspace found in Premiere Pro CS5.5 and earlier, choose Window > Workspace > Editing (CS5.5).
Adobe recommends:
• The 2-up editing workspace (CS6)

• Video: Project panel and Media Browser changes

• Blog: New editing default workspace
https://adobecs6blog.wordpress.com/2012/06/21/whats-new-in-adobe-premiere-pro/