A family of Microsoft products that enable users to capture, organize, and reuse notes electronically.
Dear respected Youssif_1,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
As per your description, I'm Sorry and I'm afraid, unfortunately in OneNote for Mac, to save entire notebook as PDF not available. We can use Save as PDF to export notes as a PDF file in OneNote for Mac. While it is available to the notes in a page rather than an entire notebook.
If you have Windows OS and installed OneNote 365 app (formally called OneNote 2016), you may easily can save/Export entire notebook as PDF file format.
In Windows OS, if you have OneNote 2016, you can go to File > Export > you can select PDF format to save section as PDF file, as shown below:
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Note: The above steps (Export this feature in only available in OneNote 2016 app), you may need to use OneNote 2016 to achieve your requirement
Appreciate your patience and understanding and thank you for your time and cooperation.
Sincerely,
Waqas Muhammad