Scheduling Functions - Global Changes - Reset Task IDs based on current Sort Order
Before using the Global Change function, the schedule should be saved if changes were made manually.
Relevant Icons on Toolbar

Reset Task IDs based on current Sort Order
- Click the 'Global Changes' button
on the Toolbar.
- Check the 'Reset IDs based on current Sort Order' option.
- Click the 'Save' button. This will automatically reset the task IDs and refresh the Gantt Chart.