This activity is used to complete a case task. Once press on the count on each element, it opens a task list, select the record you want to close, press on Details. In the navigated Case Task page, select Close. When closing the task, the value for the Message field, enter any comments manually.
To close the case task, task must be in state Open or Completed under Open Tasks In My Cases or Tasks To Be Closed elements in Relationship Management/ My Call Center lobby.
As a result case task will be set to Closed.