Today in To-dos no longer has a separate Overdue list. Overdue To-dos are in the same list as today's and say Overdue with the date they were planned for. Drag any To-do, overdue or not, to put Today in the order you want, or use its up and down buttons.
Today keeps your order on every device you use, and Team To-dos shows Today in the same order. Each teammate has their own order. A To-do you have not put in order yet starts at the top of Today when it is overdue, and at the end otherwise.