How to find a tagged document within a subcollection

I understand that if an item is asigned to a certain subcollection, it is also saved as a "copy" in my libary. So there is a doble existence of an item, both in "My libary" and in one of the subcollections where I put it in order to have an overview and in order to categorize my documents. So my problem is, if I am searching for a document/tag via the tag-search, this tag search is only taking place in "My libary", there I can find my document and open it, but it does not inidcate in which succollection it is, there is no link between "My libary" and the subcollection. If I am in a subcollection putting a word in the tag-search, I do see the results, but they are grey and I cant click on them. Only if I switch into "My libary", the results turn black, I can click on them etc....

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