I am currently evaluating YouTrack as a replacement to Jira at my company. There are a number of features I like in YouTrack but there is at least one feature we use regularly that is either missing or I simple don't know how to do. In Jira it is possible to add filters as buttons on the top of the Agile board. Although YouTrack allows me to filter via query which is great for developers and more tech savvy users it won't work for some of our less technology literate project managers.
The quick filters that we setup in Jira are by project. I created the board to do swim lanes by project but the PMs didn't like that because then they had to scroll down to see the issues for a given project.
This doesn't have to be done using buttons and I am open to other approaches to perform the same requirement as long as it doesn't require the user to perform a query.