Customer feedback: Also have the ability to see the completed tasks under each "List"
I see that you in the Completed Tasks tab have made it visible which list a completed task previously belonged to. The Completed Tasks list seems to be sorted in order by completed date. If you make it possible to sort the completed tasks in order by "belonged to list" it's at least an improvement. But having a similar list view for Completed tasks as for List/Board is preferable. One other option, which might be even better is to make it possible to show completed tasks in the List/Board view (completed and active tasks presented together) by toggling a button. Then the completed tasks can be visualized by for example a light gray text color.