The Match all feature is designed to boost the match score of all products added to the quiz for questions which are only there for data gathering purposes.
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As an example we use a quiz where we ask the question 'Are you buying this for yourself or as a gift?'. The answer to this question doesn't impact the product recommendations at all, however we still want the products in the quiz to gain a match score point regardless of the answer selected so for this we enable the Match all toggle:
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​Please note: Match all is not designed to replace product matching all together. Key products, variants and collections still need to actively be added to the quiz for it to return results.