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Hello Judithpm
Thank you for reporting this issue to the Q&A forum and I know how inconvenient this behavior can be.
From what you described, I understand that in OneNote for Mac, the section and page titles stay truncated even after widening the navigation pane, making it difficult to identify and access your notes.
So far, there does not seem to be an official fix for this behavior. As a temporary workaround, please try selecting another section or notebook, then switching back to the affected one. In some cases, this can force OneNote to refresh the navigation pane and show the full titles again.
If the issue continues, you may want to use OneNote for the web temporarily so you can access your notes more easily while the Mac app is affected.
Hope this helps a bit. Thank you so much for your patience!
Best regards.
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