iTunes Video opens up in a separate window when played. How to deactivate it?

[SethRogen]

Accidentally activated this, and want it off lol.

iTunes (TV or Movie) Video opens up in a separate window when played. How do I deactivate it? I want it to play all in one window. Like I click to play a TV Show, and iTunes turns into one big video player... instead of opening it up separately.

Here's what I have now.

Example:

 

[S.B.G]

While the video is playing in the main iTunes window, right-click (or control-click) inside the video. A list of options pops up, one of which is "Play Video in Separate window".