How to unbind movement keys and rebind them?

PlayerModule --> ControlModule --> Keyboard, line 120-129:

    ContextActionService:BindActionAtPriority("moveForwardAction", handleMoveForward, false,
        self.CONTROL_ACTION_PRIORITY, Enum.PlayerActions.CharacterForward)
    ContextActionService:BindActionAtPriority("moveBackwardAction", handleMoveBackward, false,
        self.CONTROL_ACTION_PRIORITY, Enum.PlayerActions.CharacterBackward)
    ContextActionService:BindActionAtPriority("moveLeftAction", handleMoveLeft, false,
        self.CONTROL_ACTION_PRIORITY, Enum.PlayerActions.CharacterLeft)
    ContextActionService:BindActionAtPriority("moveRightAction", handleMoveRight, false,
        self.CONTROL_ACTION_PRIORITY, Enum.PlayerActions.CharacterRight)
    ContextActionService:BindActionAtPriority("jumpAction", handleJumpAction, false,
        self.CONTROL_ACTION_PRIORITY, Enum.PlayerActions.CharacterJump)

You can adjust these to rebind some controls, for example on line 120, changing handleMoveForward to handleJumpAction, you'll jump when you press w. But I don't think it is currently possible to bind custom keys to these actions, if that's what you wanted.

---###----------[[SERVICES]]----------###--
local ContextActionService = game:GetService("ContextActionService")



---###----------[[VARIABLES]]----------###--
local DisableMovementAction = "DisableMovement"



---###----------[[LOGIC]]----------###--
ContextActionService:BindActionAtPriority(
    DisableMovementAction,
    ---------------
    function()
        return Enum.ContextActionResult.Sink
    end
    ---------------
    false,
    Enum.ContextActionPriority.High.Value
    ---------------
    unpack(Enum.PlayerActions:GetEnumItems())
)


ContextActionService:UnbindAction(DisableMovementAction)