When you press a letter on the keyboard the focus is shifted to the icon starting with that alphabet. Or when you select an icon with your mouse pointer the icon gets focused with a pale white box.

While we all love to keep icons and files on the Desktop for quick access, it results in too much clutter. As Windows changed, it allowed you to hide the desktop icons, so everything looked cleaner.

You can change nearly any desktop icon on both Mac and PC. To change desktop icons on a Mac, open the "Get Info" menu and paste in the picture you want to use. On a PC you'll need to make a .ICO file, ...