It will disappear when out of screen. And appear when you reach trigger zone. You don't need to listen to it.
Ok but i can't leave the area
Can you please leave a screenshot. I actually don't understand your problem.
Sorry, i didn't understood the mechanic, i finally reached level 1
Also, what engine do you use?
I used a Construct 2 engine for this game, but now I am working on Unity. If you have some problems you can read how to play menu. There you can ask about each mechanic.
Also did you solved you problem or you need my help?
I solved the problem