How to find Collection in which I've placed selected references?

I've saved lots of references to specific topic-related Collections... I'd like to add references related to a given topic (e.g., AI Companies) to the appropriate Collection. Search (basic and advanced) finds related articles (e.g., searching by a AI company name), but doesn't show the Collection in which I've placed the article. How can I (easily) find the Collection in which I've filed an article?
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