Completed tasks are grouped together in a heading. To access it :
From your personal space or from a workspace, click on the drop-down menu on the right side of the screen and select Completed tasks.
Completed tasks are listed here
Reset a task in progress
This feature allows you to cancel the action complete a task. The task will then be reinstated in the current tasks. To reset a task in progress :
Click on the drop down menu on the right hand side of the screen and select Completed Tasks
Click on the task to be reset
From the action bar, click on To do