Whiteboard Blueprint

Wow, this was exactly what i was looking for!!! thank you so much!, only 1 problem, how do i change the pen’s opacity? because now when i start to draw it is drawing in an almost see through color slowly becomming more visible, but i would like it to be fully visible and thick on there immideatly, but i can’t seem to find where to change that, does anyone know? thank you in advance