Just a quick update to this.
I'm using latest C3 (v53) in Windows 10 on a PC.
Kiosk mode doesn't work as stated.
I've found the 'more tools >> Add to desktop' is very hit and miss. Seems if you've opened and closed Chrome already then this doesn't work. Only works when I first open chrome after a reboot. Often just opens a chrome window at my homepage.
Hoping that 'app mode' is more consistent.
Thought I'd feed back.