Show PAST DUE tasks at TOP of AGENDA
In my AGENDA, if a task due date is on a previous date, it disappears. It would be incredibly helpful for the homepage AGENDA to have a section above the current date that indicates "past due" items - along with the date the item was originally due. Perhaps this section would grow large and be overwhelming for some people, so having an easy way to toggle it on and off would be helpful to some.

Showing it the Calendar (Agenda) will be a bit weird I think. What if we will show them in the Work section above the CURRENT WORKLOAD paragraph as OVERDUE? But it will be only your own overdue items.
You can also get access to all overdue items on the Tasks Board by creating a saved search to show you all overdue items with two clicks (select status In Progress or No Progress and Due date in the past).
If you want to see overdue to start – select ‘No Progress’ and Start date in the past