I had asked for this feature, and so I'm pleased that it has been included in the recent update of Class Notebook, however, it somewhat misses the crucial point. We do not want the entire page to be locked from student editing after a teacher has given their feedback. It is absolutely crucial that students respond to teachers' feedback by improving their work, or else the process of giving feedback is rendered pointless. I was really hoping that my annotations/contributions to a page cannot be edited by a student, but that they can continue to edit the page, to continue to respond to and develop their work. Many thanks for working on this.
Microsoft