On Chromium, when searching for a bookmark in the bookmark manager, you can click the 3-dots next to the search result and click "Show in folder" to reveal where it was saved. Opera's bookmark manager does not seem to have any way to do this.
Reasons to have this feature:
When a bookmark is found by search but not in the folder I expect, there is no way to find out which folder it's actually in (other than to export bookmarks, import into Chromium, search for it there, reveal which folder it was in, then come back to Opera and manually click to that folder). Obviously you could just delete the bookmark and add it again, but then you'll never know where it actually was, it will forever be a mystery.
Sometimes I find a duplicate bookmark (usually from Imported bookmarks), so I want to keep the new one and delete the old imported one. But without being able to see the folder path of each bookmark, I don't know which one to delete.
There are currently two columns in the bookmark manager's search result: Description and URL. I would suggest adding a third column that contains the bookmark path. It would be read-only, and clicking it would take you to that folder.