split screen

<I have an older Toshiba that a friend just gave me. I can get the remote to turn on and off PIP (picture in picture), yet when I try to play the DVD there is a split screen (which does not look like PIP nor does it turn off with the PIP button...or at least that is what I think it is called. The DVD plays but instead of one big picture, there are two identical pictures the same size on the screen. There are no instructions in the manual for this.
thank you for any help,
kathie anne>