Mac OS X: How to Change Desktop Icon Size and Arrangement

You can change the size and arrangement of icons on your desktop using the Show View Options command.
This article has been archived and is no longer updated by Apple.
Follow these steps:
    1. Click the Finder icon in the Dock.
    2. Choose Show View Options from the View menu. The Desktop window appears.
    3. Use the slider and radio buttons to set the icon size and arrangement as desired.
    4. Close the Desktop window.
Published Date: Feb 20, 2012