Hello AveryBC,
Welcome to the Microsoft Community.
Thank you for sharing your experience with our community! We have tested your issue on our test devices and it turns out that the situation you describe is a design issue. There seems to be no solution at the moment. But maybe there is a workaround: That is, not to use the "dock to desktop" option, but to manually resize the Sticky Notes window to the maximum size (by using your mouse pointer to scale the border). In fact, you can resize the window to the same maximum size as when it is "docked", while this way the window will not affect the other desktops.
Anyway, you are welcome to share your feedback about this application using the feedback button in Sticky Notes. Your feedback will help Microsoft improve their products better! Thank you for your understanding and support.
Best Regards,
William.Y | Microsoft Community Support Specialist