In this frame is displayed the current selected image if it belongs to the source directory. Different displaying options (zoom and antialiasing) can be chosen by the View Menu in the Menu bar or by the View Pop-up Menu that appears click the right mouse button when your are in this frame area. User can synchronize source and target display frames usign Synchronization Command in View Menu: in this way zooming and scrolling will be applied in the same way to both of frames.
How to find it.
You find it clicking on its name in the Main Window.