You can mark a task as completed so that your collaborators are notified of the completion of the task through a notification.
You can set the activity status in 2 ways:
Set the status of the activity directly from the view of all your activities:
Click on the button.
Set an activity as "Completed".
Set the status from the activity detail page: "Mark an activity as completed":
Click on "Activities" from the left-hand side menu
Click on the activity you want to mark as completed
In the side menu “Activity Status” click on “Complete”