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Hi Dave,
There's a possibility that your OneNote app encountered a software conflict that's why it's acting differently. If you're used to adjusting the container width before, there's a chance that there are changes that happened to your system settings. To resolve your concern, we suggest that you do a https://support.office.com/en-US/Article/Repair-an-Office-application-7821d4b6-7c1d-4205-aa0e-a6b40c5bb88b#ID0EAADAAA=Windows_7_or_Vista**[repair on your Office application](https://support.office.com/en-US/Article/Repair-an-Office-application-7821d4b6-7c1d-4205-aa0e-a6b40c5bb88b#ID0EAADAAA=Windows_7_or_Vista)** and check if your concern persists.
Feel free to respond if you need additional help.