Our 2009 Hawk has a screen door. There's a black plastic catch on the main door that lifts and captures the handle of the screen door latch so the screen door opens with the main door.
The catch on the main door not only holds the screen door to the main door but also lifts the screen door latch handle high enough so the screen door latch doesn't engage the door frame. That way, the screen door moves with the main door and doesn't need any separate attention. In this configuration, it is the main door latch and not the screen door latch that holds the doors closed.
When I want to close the screen door but leave the main door open, I lift the screen door handle off the main door black plastic latch. That allows the screen door handle to drop down enough so it will engage the door frame and hold the screen door closed by itself even with the main door open.
The trick is to adjust the black plastic catch on the main door so that it holds the screen door latch handle high enough so that the screen door latch doesn't engage the door frame when both doors are closed. This may take a bit of adjustment. For sure, you don't want the screen door to both be captured by the main door catch AND engage the door frame when the doors are closed. Then you are liable to break the screen door handle/latch when you open the main door because that pulls on the screen door at the same time the screen door latch stays engaged in the door frame.
Hope that helps.