I don't remember exactly, but there should be a rod coming from the door lock knob at the top of the door to that lever with a hole in it about 2 inches below your red circle. (The one you push down to lock the door from the inside.) That rod is attached somehow to the door latch handle. (The lever you pull to open the door from the inside.) That lever has a spring built into it and keeps the lever in your red circle against the door knob push button. It looks as if these rods are all missing or have fallen off to the bottom of the door.