What I did: Dragged the note to the top.
What happened: It pinned it, rather than just shifted the order.
What I expected: Just move it to the top. I accidentally selected don’t show again at one point when it asked to pin or move and now it will only pin it. I can’t find the option to show that dialog again.
Things that might be helpful to know (Agenda version, OS and model, etc):
macOS Catalina: 10.15.2