About color change of lights ON/OFF in WORLD 7-3 and WORLD 15-2

Originally, the stage had a screen that switched between black and white. This resulted in excessive strain on the eyes, especially for players. We had been working on a temporary solution to change the screen from black to a background color, but today we have changed the behavior to one where the shutter goes down. Its ON/OFF is now manual instead of automatic. I think this has improved the eye strain and tempo.