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The available information does not document any way to persist a custom zoom level across OneNote sessions or to configure a global default zoom level. Current guidance only covers how to change zoom per page using keyboard shortcuts or the View tab; it does not mention persistence or related settings.
For now, zoom must be adjusted manually each time using the documented shortcuts for the specific platform (for example, Alt+W,E / Alt+W,W / Alt+W,Q on Windows desktop, Command+Plus/Minus on macOS, or the View tab zoom controls). There is no supported configuration option in the provided documentation to make OneNote remember zoom across restarts or to define a global default zoom.
To influence future behavior, feedback can be submitted through the standard Office feedback channels (for example, Help → Feedback in Office apps), which are referenced in the broader Office support materials.
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