[Zubersoft]

It sounds like performance mode has been enabled. To disable performance mode, tap the lock icon in the floating toolbar at the bottom right corner of the library screen. This same toggle can be accessed by tapping the bottom right corner of the screen while a song is loaded to display the quick action box. Once you've disabled performance mode, tapping in the center of the score will bring up the song overlay, and then you'll have access to change the display mode and the other settings.  Let me know if you have any questions.

Mike