No fee to watch behind glass wall. They have a few sitting areas where u can watch
We were there yesterday and it was fantastic.
On the first floor they set up chairs. There may or may not be enough. Depends on how popular the show is. And the kids sat on the floor in front.
But you can also watch from the second, third or fourth floor. There is seating by a lot of the areas looking down on the stage. Even when the first floor is crowded, the other floors are not.