If you're using OneNote Class Notebook in your classroom, your students will have access to all of Math Assistant's features. To turn off math equation solving and graphing for your students during times they're working on tests or homework, follow the instructions below.
Notes:
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The ability to turn Math Assistant features on or off is only available for OneNote Class Notebook owners with an Office 365 Education license.
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This feature is only available if you have a Microsoft 365 subscription. If you are a Microsoft 365 subscriber, make sure you have the latest version of Office.

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Navigate to the Class Notebook.
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In the Draw tab, select Math > Turn Math On or Off.
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In the Math Options pane that opens, type in how many minutes you'd like math features to be turned off for students. De-select the checkboxes next to the features you'd like turned off.
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Select Apply.
The math features you turned off will be disabled for students during the timeout period. To edit the timeout period or which features are turned off, return to the Math Options pane, make your changes, and select Apply.Note: During the timeout period, students will not be able to access Math functions in any notebook while their Class Notebook is open. They will see a notification when they attempt to use Math Assistant. However, they can still convert ink or text to math.
See also
Solve math equations with Math Assistant in OneNote
Draw graphs of math functions with Math Assistant in OneNote