If your desktop icons are too small and hard to see or too large and you would like to see more of your favorite background image, you can resize them quickly.
Click or Scroll to Resize Icons
Place your cursor in an area on the desktop not occupied by an icon. Right click on the mouse. Choose "View." In the View submenu, choose "Large icons," "Medium icons" or "Small icons."
You can also use the scroll wheel on your mouse to resize the icons. Place your cursor in an empty place on the desktop and hold "Ctrl" on your keyboard while you operate the scroll wheel.