how to add a new field in the columns tab, let's say, the new field name is "completed date"? As far as I see, there is no field like "completed date" in the columns tab which we require to sort out issues with completed date and need to rediscover why the scope of this field is not added in the columns tab since it is required for our project to pull some statistical data. I see "Verification date", "Implementation date", "Begin date", "Target date" and so on.. but not "completed date"