My building is telling the toilet door that feng shui is not good. I want to block it with a bead curtain. I wonder if it's okay to use a short arc curtain. Or choose long curtains?

The toilet opposite the door has dirty air, preferably a screen, which is not as good as a big house with a yard now. If the screen can't fit, a bead curtain will do. Curtains are used for blocking. Isn't the arc just to let the dirty air pass through? Hehe, long curtains are nice! If the lighting is good, it is ok to hang ordinary opaque curtains. There is a saying in Feng Shui that "seeing is believing", but the bead curtain may look better than the cloth curtain!