Working dialogue system?

Hi,everyone! I’m making a game with dialogue in it, and I’ve managed to do it with a timer. It works fine, but a huge downside to this is that if the player isn’t looking at the screen, he/she won’t be able to read it! Is there any way I can make it so when a dialogue line appears,it stays there until the player presses a key to change the line?

upload your proyect folder o post image of the events.