Hi
Are your notebooks saved/synced to cloud, such as OneDrive?
- If yes, are your lecture files PDF files and inserted as File Printouts?
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- I suggest you go to OneNote online, check whether you may open the notebooks and remove these PDF Printouts. Then go back to OneNote for Mac, open it for a check.
- If your lecture files are not synced to OneNote online or the issue still persists after removing these files, under the case that your notebooks are synced to the cloud, you may refer to Magnus_Denmark's reply in "Microsoft OneNote overuse of Memory maybe the cause of a sync issue?".
- Open OneNote and (quickly before memory usage is too high) sign out your account in the lower left corner. The function of this is to stop the sync. This will probably ask you to close your notebooks afterwards, try and force quit OneNote from the dock.
- Open OneNote again and make sure that you are signed out. You should see that it says there is an issue with sync (because you are not signed in). Open Activity Monitor (Applications -> Utilites) on your Mac and confirm that the memory leak has stopped.
- Right click on the notebooks in the menu on the left and close them. This will remove them from your Mac locally. It might take a while depending on how many notebooks you have and how much they contain. Beware that any notes that are not synced to the cloud will be lost.
- When OneNote is completely empty and there are no notebooks in it, quit the app from the dock.
- Clear OneNote] cache: When Finder is active, press Command+Shift+G and enter "~/Library/Containers/com.microsoft.onenote.mac/Data/Library/ " move the "Caches" folder from there to the trash.
- Open OneNote again and sign in with your account.
- Open your notebooks from the cloud and sync them.
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