In the Help Center, an issue regarding articles in higher-level tiers not being found when searching in lower-level tiers

For example, if there is an article about "Cancellation" in Section A of Category A, searching for "Cancellation" in the search window of Section B in Category B does not yield any results. This significantly impairs the user's search experience and also affects the aggregation of metrics in "Explore" for "Search Results Found/Not Found."

We would like the following improvements:

Enable searching for articles from lower-tier sections in higher-tier sections or in different categories and sections.
In "Explore," allow the aggregation of metrics to determine which articles, when searched in the search window, resulted in "No Search Results."