Search in collection doesn't return items in subcollection

The title says it all: When I search for something in a collection, this "something" is not found by the search function if it happens to be in a subcollection of the collection I'm searching in.

Is there a fix to this or a preference option that I'm missing?

Edit: This is for the quick search, of course. For the advanced search, there's a tick box to choose whether to search sub-folders, but is there a similar option for quick search? Either way, the quick search should include sub-folders by default.

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