This is a crucial feature, it seems to me. AFAICT, Agenda seems to sort first by assigned date, and then by creation date-time. This would be (barely) acceptable if I managed always to create notes in the order that I want them displayed in.
But I’m not that perfect. I’ll often remember to add a new note several hours after its proper slotted time. And there’s currently no way at all to get it “right,” other than deleting and re-adding each subsequent note in order.
Please enable the grayed-out “View > Sort Notes by” options in projects!