The Retry message is dimmed because you have 2 attempts and marked that you wanted 2 Failure messages. You should have two Incorrect captions, maybe they are still covering up each other. That is very annoying: all the feedback text containers (can be captions or shapes depending on the theme) are overlapping also in the Master slides. You can move them to see all. I mostly use shift-arrow combinations to move vertically up, easier to get them back in place after editing.
Forgot your second question: you can change layout of quiz slides, but what you asked is not about the layout but about changing a knowledge slide to a question slide: that is not possible.
You have 2 attempts. This will happen:
- First attempt successful: Success message appears
- First attempt failed: Try message appears
- Second attempt successful: Success mesasage appears
- Second attempt failed: Failure message appears.
That is the design of question slides.