In the most recent release of iTunes, the layout has had some major interface changes. One of the most obvious being the close, minimize, and maximize buttons (red, yellow, and green buttons) being in a vertical layout instead of a horizontal layout. Here’s how to fix it:
- If iTunes is open, please quit it.
- Open up Terminal in the Applications/Utilities folder.
"defaults write com.apple.iTunes full-window -boolean YES"
- Now, open iTunes and you’ll see that the red, yellow, and green buttons are horizontal.