I want to set max scene size, i dont want infity falling
What do you want exactly?
Some games kill your character when it falls off some limit, in that case, you can do:
Conditions: Position Y of Player is > 500 (500 is the bottom limit)
Actions: Kill Player (set variable Life = 0, for example)
Others just kill you when your character has been falling a distance that makes it impossible to survive from, even if you have the ring to not taking damage from falling
But the last one is a bit more complex to reproduce.