Hi Lawrence,
I'm Sumit, here to answer your query at the Microsoft Community.
Apologies for any inconvenience you are experiencing. We are happy to help you.
The User Data folder contains your Edge Profile Data. It includes everything - from History to cache. You must not remove that or delete anything in that for smooth operation.
Use Treesize and navigate to the User Data folder after selecting C. Send us the screenshot afterward. We will tell you what aspect is taking up data inside it.
https://apps.microsoft.com/store/detail/treesiz...
You can send us a screenshot after selecting the drive for the next steps.