Quiz (Question Set)

We've created a question set with multiple drag Text questions. We can disable each question's retry, but there does not seem to be a way to disable the retry on the whole set. We want students to have one chance to complete the activity. We've tried everything to disable the set and only allow one try. Nothing seems to work.

1. Steps to recreate

When I add the Quiz to my page there are very dim outlines of button sized rectanges with rounded corners above and below the question form adding a lot of white space between elements above and below.   Is there any way to review them so I can get text closer to the question?  thnx

I see Question Set as a possible content type under examples and downloads.

However, when I use the editor on H5P.org I do not see this content type in the drop-down selection.

Can anyone please advise.

Many Thanks