One of the first things I noticed about iTunes 10 was those ridiculously awful vertical buttons. Seriously, what were they thinking? And as a fellow developer pointed out, that even violates Apples own Human Interface Guidelines… Not to mention it’s a crime against humanity.
Someone much craftier than I figured out that all you need to do to restore those buttons back to their horizontial counterparts is open up a Terminal window and enter the following:
defaults write com.apple.iTunes full-window -1
Press Enter, close Terminal and restart or open iTunes. You should see things are now back to normal.