I see that you can set a password to exit the presentation, but I was able to exit without a password by using the ESC key
This functionality is supposed to work with virtual keyboard. It would be easy to prevent the player from being closed, but with hardware keyboard it would be difficult (or impossible on the application layer) to disable all “dangerous” OS-related hot keys. It is up to deployer to disable “Alt+F4”, “Ctrl+Alt+Del”, etc key combinations. How did you exit by the “Esc” key? I thought this was a safe key.