Apple iMac computer - Manual (Page 30)

30 Chapter 2 Getting to Know Your iMac
Customizing Your Desktop and Setting Your Preferences
You can quickly make your desktop look the way you want using System Preferences.
Choose Apple () > System Preferences from the menu bar.
As you get to know your iMac, explore the other system preferences. System
Preferences is your command center for most settings on your iMac. For more
information, choose Help > Mac Help and search for “System Preferences” or for the
name of a specific preference.