You must disable EFS AFTER decrypting the files. If you disable EFS first, you will not be able to decrypt existing files.
There are 2 methods to stop EFS from encrypting in Windows 10.
Method 1: Using the File Ownership Context Menu
Open File Explorer and browse to your user profile folder C:\Users\user_name. You should see gold padlock icon over the desktop item. Just right-click it and select File ownership -> Personal.
Method 2: Disable EFS Using Another Admin Account
Another solution is to log in to Windows with another administrative account. Right-click on the Desktop folder and select Properties. Go to the General tab and click Advanced. Untick that option “Encrypt contents to secure data” and click OK.
Hope above information can help you.
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