Y a-t-il un moyen de voir un aperçu des catégories qui ont 'Solved' activé ?

If Solved is enabled per-category, is there a way to quickly check all categories to see which ones it’s enabled on?

I don’t think this is possible through the UI, though you could pull this information out using a data explorer query. Something like this perhaps:

SELECT ccf.category_id
FROM category_custom_fields ccf
  JOIN categories c ON c.id = ccf.category_id
WHERE ccf.name = 'enable_accepted_answers'
  AND ccf.value = 'true'
ORDER BY c.position ASC
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