The Preferences dialog box defines a default page layout and customizes your application in many other ways. To modify preferences, choose Edit > Preferences (Windows/UNIX) or Reader > Preferences (Mac OS), and select the panel you want under Categories. For viewing PDFs, examine the preferences options for Documents, General, Multimedia, and Page Display.
The preferences settings control how the application behaves whenever you use it; they are not associated with any particular PDF document.
Documents preferences
Full Screen preferences
General preferences
Page Display preferences