When you click on tasks that are ‘Due Today’ it will pull out all tasks – from all folders – so you will see in the Due Today list tasks in the ‘In Tray’ folder for yourself and also in any other task folders you have set up. 

If you click on the individual task folders for ‘In Tray’ and your own task folder name you will see the tasks in each of these folders.

The example below shows that 1 out of the 3 tasks due today is in the 'Helen' folder only: