Split screen on the video

I recently undid the split screen on the video portion of the web page. How do you get back the split screen? I can't find a button to undo it.

Hi there! I believe we spoke on the phone, but just wanted to make sure everything is going okay for you. Let us know if you have any further questions! 

Hi there, I am not sure what you mean? Please clarify. Don't forget, you can reach out to us at admin@guitartricks.com as well. 

I'm guessing you mean the screen has the video player on the left & the music notation on the right.  But in the upper right corner of the notation there is a button to Popup or Hide.  The problem is that once the user clicks either of those, the notation is in a separate window or gone, replaced by only the video player.   There is no button to reverse the process.

The notation is still available below the video player (click the Notation tab).  Or you simply refresh the page (F5 on a WinOS).  That resets the page for me & the screen is once again the video player on the left & the notation on the right. 

Hope that helps.