The 'Sum of remaining estimate' column displays aggregate values calculated in Structure that are not available to JQL.
We are looking at making similar functionality available in our next major release of Structure, we have a feature request here - https://jira.almworks.com/browse/HJ-1800which you are welcome to vote up and comment on.
You can use the search bar and filter button as described in the documentation: Searching and Filtering Within Structure.
Search alone highlights matching results (non-matching results are grated out), while the filter button hides non-matching results (except their parent issues - this is so that the hierarchical view is preserved).
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