Hi,
Downgrade from Windows 10 Education to Windows 10 Pro need to reinstall Windows 10 with ISO image or your DVD disk. But this action will not affect your personal data, it just remove and deprecated some features. Here is a link for a downgrade video, which shows downgrade from Enterprise to Pro and might be useful to soothe your anxieties. We could see clearly user account and desktop third party application icons were reserved after downgrade.
https://www.youtube.com/watch?v=r5GnFru0zas
But if you are afraid of lost data during downgrade, It's a safe bet to backup your personal data.
Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.
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