To see objects located outside the boundaries of a page in a publication, select the option from the View tab.

Scratch Area

Explanation:

Just like the question said, the Scratch Area is used to view objects located outside the boundaries of  a page. When an object is outside the boundaries of a page, they area located in the scratch area. By checking the scratch  area option, the object in the scratch area are displayed and if the option is unchecked, the objects are hidden.

answer inspecting packets in isolation from their context;