What do the Review Flags on Quarterly Priorities mean?

Review Flags on Quarterly Priorities will become visible if a priority or sub-priority has not be updated in 7 days and today is between the start and due date.

For example: the Review Flag is turned on when the Actual for type of progress has not been updated in 7 days, and today is between the start and due date.

To clear the Review Flag, you will need to either update the progress for the Actual or click on the flag 'Mark As Reviewed' in the sub-priority which will remove the flag from the quarterly priority.