Very interesting, thanks. I watched 7 or 8 videos with this program and did not see a simulation anywhere.
But in this form as in the video – just displaying the appearance of the windows – the simulation does not make any sense. The simulator must be able to work with the COM port, sending and receiving display events and commands, so that you can check the work with an external MCU.
You can see how the developed windows look in the Stone Designer itself, for this you don’t need a simulator 🙂