Change the max hight of a projectil

hi how can i change the max high of a projectil (by example,I want the projectile of cannon tower to be very high before killing)

And how can i change the size of the projectil?

You want the projectile of the cannon tower to go up high and then come down and kill the enemy? Change the field marked "Combat - Attack (1 or 2) - Projectile Arc."

Okay thanks,and is it possible to change the size?(of the projectil)