The File Information panel displays technical information about the file currently opened:

To view File Information, you can select Info... from the File Menu, or select a color separation in the Inventory / Separations panel, and press the Info button in the bottom-right corner of the Separations panel.

The information you see depends on whether Show Advanced information is checked in General Preferences or not.

Without Show Advanced Information, the following information is displayed:

With Show Advanced Information, the following information is displayed: