There is currently no search function within the user story map view. Right now, I have to use the browser's standard search function, which only scans visible text (i.e. the card names). It would be great to have a dedicated search function that returns results that match across story descriptions, comments, file attachments, releases (archived or not), etc.
When you have a smaller user story map it's not quite as important, but this is crucial for larger maps with 100+ cards.