It seems that the simulation worked only in the old version of the program – Tools 2019. In the new program – Stone Designer – I have never seen a video with a running simulator anywhere.
About the versions – it seems that only a couple of days ago version 1.1.4 appeared with minor changes (the simulation still does not work).
As for the simulation – its absence, of course, saddens, but it is quite possible to work without it 🙂