How to set the slide doesn't end unless the user clicks?

I am creating an eLearning training course with Storyline.

I found the timeline is too short for learners to view the slides or complete the interactions. I know we can drag the timeline end line to set the timeline longer, such as 900 seconds.

But I would like there is no end time for learner in each slide. So that learners can stay on the slide as long as that like, or the learners can not go into next slide unless they submit the answers for the quizzes.

Is there a way to do that?

Thanks very much!