Use the left and right arrow keys to change the number of balls. (tap left and right side of the stage) Press the spacebar to display ball trajectory. Press r key to switch basic/reverse. Juggling patterns are cascades for odd numbers and fountains for even numbers.
You can juggle ANY number of balls now, with limits removed. I assume there is a sprite clone limit though. Don’t go too high or you’ll break Scratch forever I assume (copy and pastes infinity symbol into set number bar lol)