Each kit has a maximum size a course may be. However, your actual course size depends on multiple factors including the space available; conditions such as uneven ground or an inclined playing field; if there is tall grass or leaves, etc., the line drags through; type of lure; how many corners/pulleys you use, etc.
Adding more line or pulleys won't allow for larger courses, as the limit is due to the power of the motor.
Chase maximum course is 100 feet.
Home Original maximum course is 200-300 feet.
Home Plus maximum course is 750 feet.
To change the size of the course - either cut the line to make it smaller - or tie the line together to make it larger.