Feedback visibility options should work as below:
A public note visible to any person in the organization
Managers in the hierarchy of the worker about whom the Feedback is created
Managers in the hierarchy of the worker, and the worker who receives the feedback
A private note created by an author about the author or another person and visible only to the author
A private note created by an author about the worker and visible only to the worker and author of the note
I hope this blog post was helpful for you. If you have any questions or feedback, please leave a comment below.