An easy for students to use OneNote for group project management is to simply create a new shared notebook and on the first page include a task list. Then when group members complete tasks they can check them off. The nice thing about this is that students can see the task that have been done and who did them. They can also uncheck tasks or add notes if a task needs to be done again.
https://www.freetech4teachers.com/2022/02/how-to-create-collaborative-to-do-lists.html