I think it is really frustrating that I can't simply quit Creative Cloud without a dialog box coming up every time asking me if I am sure. Of course I am sure that is why I am doing it. May we get an option to turn that dialog box off? That would be great, thanks!
Unfortunately, there is no settings to be precise that can help in getting rid of the dialog box. Kindly request you to share your feedback in the following feature request/feedback form that will be monitored by Adobe Team : https://www.adobe.com/products/wishform.html