You can write your topic however you want, but you need to answer these questions:
What do you want to achieve? Keep it simple and clear! I’m trying to lock a player from leaving a VehicleSeat. I’ve tried to do this by setting JumpPower and JumpHeight to zero, and by using SetStateEnabled. I have no idea why it isn’t working at this point.
This behaviour does seem like it should work, but the standard way of stopping a player jumping out of a seat is to simply set their Humanoid.JumpPower (or Humanoid.JumpHeight if its enabled instead) to 0!