How does a Gantt chart show overdue tasks?
Right-click on the display and select the 'Show Overdue Items Only' option. The display shows only those items for which the end date has passed but that are not 100% complete. These items do not have red highlighting. Right-click on the entry and select the 'Refresh' option.
What are overdue tasks?
If a task has not been completed on its due date, it will become an “Overdue task”.