Hi @c_mironiuc
You can make an ungraded quiz a module requirement, and so I just tested this to make sure that ungraded surveys would also work in this function, and they do. This guide will get you there, How do I add requirements to a module?
However, Canvas does not include an opt-out feature, so all students would need to complete the survey before being able to move on. One way to work-round this might be to make the first item in the survey an opt-out question like, "I choose to opt out of this survey (true/false)." Then they could submit the survey without completing the rest of it.
I hope this helps,
Kelley
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