[open] Mandatory questions
What I couldn't find on the OS Doc and the Forum is how to make sure the participants fill in all the questions. There is probably a very easy option to set questions compulsory, so the "next" button will only appear when all questions are answered. Thank you in advance 
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Comments
Hi,
The issue of form-input validation has come up a few times before. Maybe these discussions will be useful:
Cheers!
Sebastiaan
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