Use the Display tab to hide or show audit and pages pane.

Moreover, you can scale the audit pane, that's by default shown on the right side of the tracking layout. Drag the splitter left or right. If you drag it to the right edge of the window, the audit palette is collapsed.

In the similar way, you can scale the pages palette (in the top part of the tracking window).

All palettes (by main tab)

Articles, Collections, Contacts, Editions, Media Galleries, Pages, Planning, Publishing, Reports, Shell, Start, Tracking, Trash can

Note: you cannot reconfigure the palettes.