Hi Molly,
This is Wil, one of the independent advisor, an expert with Windows 10 and a fellow Windows 10 user like you.
To stop a certain folder from syncing on OneDrive, you may deselect it on the OneDrive settings.
- Right-click on the OneDrive icon on the system tray (bottom-right part of the screen).
- Click on More and click on Settings.
- Click on the Account tab and click on Choose folders.
- Uncheck the folder that you don't want to sync on OneDrive, you may expand each folder by clicking the arrow beside it.
You may also refer to this link. https://support.office.com/en-us/article/choose...
I hope the information I provided will help you. If you need further assistance please do reply back and I will respond as quickly as possible. Have a nice day.
Thanks,
Wilfred P.
Independent Advisor