User Configuration > Administrative Templates > Microsoft OneNote 2016 > OneNote Options > Editing
User
HKCU\software\policies\microsoft\office\16.0\onenote\options\editing
This policy setting controls whether users will see and be able to accept text predictions when writing notes in English in OneNote. If you enable or don't configure this policy setting, users will see and be able to accept predicted text by using the Tab key or right arrow key while writing their notes. Or they can simply keep typing to ignore the predicted text. If you disable this policy setting, users will not be able to see or accept text predictions while writing notes. Note: This policy setting only applies to subscription versions of Office, such as Microsoft 365 Apps for enterprise.