How to turn off Audi A7's engine push start button?

I am having trouble finding a way to turn off my Audi A7's engine push start button. It seems like there is no obvious button or switch to do so. Can anyone help me figure this out?

To turn off the engine push start button in your Audi A7, press and hold the button for about 5 seconds. This will shut off the engine and turn off all electronic systems. Make sure to shift your gear into park before doing this.

You can also turn off the engine push start button by using the key fob. Simply press and hold the lock button on the fob for a few seconds, and the engine will turn off.