I recently installed a new display screen and a separate screen for the piano. When setting the whole thing up, I must have inadvertently set the main screen as the display screen. Now, when starting OpenLP the main screen shows as the display, but the projection screen is neither of the other two screens. It must be set for the old display screen, when is no longer on the system. I hate to have to reinstall OpenLP, because I will lose all the work I put into my song lists. How can this be corrected?