Deleting a Task will remove the Task and associated Task Events from Reclaim and the calendar. There is no way to bring the Task or Task Events back.
Delete a Task
Click on the Task Event or Habit Instance to open the details in the side-panel
Click the three dots labeled More options at the top.
Other ways to delete a Task
Delete a Task Event
Deleting a Task Event does not delete the Task. Reclaim will reschedule the Task Event. Refer to Reschedule a Task Event.