Sorting your Kanban board by assignee categorizes work items into columns based on the colleague they are assigned to. Each column will include all work assigned to that person as well as a section of work items under the sub-heading: Also working on.

The work items listed under 'Also working on' includes any work items that colleague is involved within some capacity, but not directly assigned. This may mean that they are assigned tasks, notes, or emails within that work item.