Designing a Start/Stop Mechanism for a Stateflow State Machine

I have a simple state machine with two top-level states: Off and On. The On state contains the substates aState1 → bState2 → cState3.

In this configuration, I can use the start signal to trigger the transition into the On state and then exit after executing the substates. However, I am not able to automatically turn off the toggle switch when exiting the On state.

Would you like me to suggest how to implement the auto-reset of the toggle switch (e.g. by using a latch with a feedback signal from FSM) or rewrite automatically value of the start block?