If you had selected what looks like a textbox instead of the detail section of the form I'd have a better notion because the property sheet for the control would be in your pic instead. To me it looks like a calculated textbox where the expression evaluates to "(New)" if there is no ID value. If there is, it evaluates to "Open". One of those values would then appear in the control when in form view.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.