When my family attended CP we had 'reserved seating' i.e. had a dinner package. First come, first serve type of seating. Lined up along the lagoon railing down toward the Japan pagoda. When we entered the theatre the cast members filled the seating from the front to the rear of the theatre. We did not get to select our seats. Once everyone was in who had packages they opened the theatre to those who did not have packages. These people were lined up along the lagoon railing toward the Germany side.
However, you will find that all the seats are very good -- it is just a matter of assuring that you gain entrance - the dinner package does this for you.
Many guests just sit around the American pavilion and listen to the performance. (You have to be willing to put up with people walking by in speaking in loud voices..) :xmas::xmas::xmas: