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Hi G_6084,
Greetings. Thank you for posting the thread to our community.
I understand your concern, it seems when you turn off the Math Assistant feature in your Class Notebook, students can still be able to use solution steps on their side.
Generally, to disable the features of the Math Assistant feature, just to un-check the boxes next to the features you’d like to turn off in the Math Options menu. For your reference: Turn Math Assistant on or off in OneNote Class Notebook - Microsoft Support
If you are setting in the right way and the issue persists, since you mention you are using the online version of class notebook, I’m afraid this is a temporarily server-side issue needs to be investigated from back end to find the cause. The support team has higher permission to remotely assist you and collect background logs for the root cause. This is a more efficient way in handling this case for you.
If you are an admin, I recommend you get support by following steps from this link: Get support - Microsoft 365 admin | Microsoft Learn.
If you are not an admin, you can contact your admin to contact Microsoft support. You can look for the way to find your admin through this link: How do I find my Microsoft 365 admin? - Microsoft Support
Appreciate for your patience and understanding.
Hope you having a nice day.
Sincerely,
Harry | Microsoft Community Moderator