The folder icon is probably no longer visible because there's a button object with a longish name that is pushing the folder icon off to the right out of view. It's a known issue where buttons have long names. Don't expect a fix.
The Continue button on the Results Slide cannot be programmed like other buttons. It DOES do something, but what it does depends a lot on how other things in your Quiz Settings are configured. Usually it will allow the user to advance past the Quiz Results slide. If it's not doing that for you, then check your Quiz > Settings > Required option. It may be set to something that requires the user to pass the quiz or answer all questions.