When using the iOS app Jira Cloud, I can see my Backlog much like on the web interface, but there seems to be no way to filter it or access any quick filters. The active sprint view does show quick filters, but these do not apply to the backlog only the sprint itself. I have read you can use JQL in the search box but this doesn't seem to be working. We use a single large board for several teams then filter by project, so on the app I can't really use it since there are so many issues. Am I missing something or is this a missing feature?