I love the Mini player. My family loves the Mini Player. When I used the old version of iTunes getting into and out of the Mini player was second nature. Because iTunes 12 changed everything I'm going to take you through a quick tutorial on how to manage the Mini player window.
When you first open the new iTunes you are greeted with a much different screen. The look and feel has changed and the sidebar has, for the most part, disappeared. I won't go into the changes here but for those that haven't loaded it yet here's the new look.
Notice that the normal minimize button on the upper right of the window is now gone. So how do you switch to the Mini Player. You could use the "Window" menu.
If you are a die hard keyboard user you can also use the key combination listed in the menu. But if you are used to just clicking a button like me you can use the secret hidden button I finally discovered.
If you hover your mouse in the center of the iTunes window where the Apple logo is located a small icon appears. Click on it and your view will change to the Mini Player.
So how do you return to the normal player you ask? Good question, and counter to intuition all you need to do is hit the "X" in the upper left corner of the Mini player. The Mini player window will close and the full sized view will return.
So what happens if you are playing music? What then? Well the look changes a bit but the action is the same. Again hover the mouse in top, center of the screen but this time over the album artwork.
There you have it. A quick guide to handling iTunes and switching between the large view and Mini player view of your media. Aren't you glad I figured it all out for you? I know my family is. And since I don't handle family insurrection well I am too. Now everyone is happy.