CharacterJumpPower determines the starting value of
Humanoid/JumpPower for a
Player/Character|Character. This property is only visible in the Properties window If
StarterPlayer/CharacterUseJumpPower is set to true, as it would not be relevant otherwise.
Since this property is only relevant for characters being spawned in the future, changing it will not change any existing player characters. Changes to this property will only take effect when a player respawns.