If an administrator is looking at a task with an expiry date, she can extend that date if needed. (This option will display when the task was initiated on-demand by a user AND an organization has their database setting to apply automatic expiry dates to on-demand forms enabled.)
Click 'Reset Expiry' in the top right
Check the date indicated as the new expiry date
Confirm by clicking 'Reset Expiry'
You will return to the view of the task
If users view the task from their Assessment & Evaluation badge, they'll see the updated expiry date on their task card.