What does the Assignee filter do?

The "Assignee" filter highlights the issues assigned to a selected user. To do this, press the "Assignee" button in the sideboard and click on the user you are looking for.

Open

After that all swimlanes are closed where there are no issues assigned to the selected user. Accordingly, all swim lanes are opened where there are existing issues assigned to the selected user. All issues that are not assigned to the user will be greyed out.