If you want to allow users to have more than one attempt at a quiz during a single user session, then you need to configure the options under Quiz > Settings > Pass and Fail. Your screenshot does not show that specific area of quiz settings so I cannot confirm if you have it set up correctly. You can even set the option there to give the user Infinite Attempts to successfully complete the course. If you do, don't forget to also check the box to Show Retake Button, otherwise you will leave your users stranded at the end of the quiz.
However, you need to pay attention to the fact that I have mentioned this applies within a single "user session", that is, a single launch of the Captivate course module from your LMS. If your users do not have multiple attempts allowed to complete the quiz, or they close down the module before successfully completing it, then you would need to configure your LMS to allow multiple launches of the module in order for the user to reattempt the quiz again.
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