The certificate is installed for the user that works with Fiddler Everywhere. To remove it, follow these steps:
1. Open the "Manage User Certificates" control panel window. The easiest way to do this is from the Windows Start Menu - search for "manage user".
2. In the window that opens, expand the "Trusted Root Certification Authorities" item and select "Certificates". In the list on the right, find the certificate with a name "DO_NOT_TRUST_FiddlerRoot".
3. Delete the certificate. There should be one or two prompts when you try to delete it - you must answer "Yes" in both cases to fully remove the certificate.
I will log a feature request to have the remove option in the Fiddler Everywhere HTTPS settings (like in Fiddler Classic) and also I will forward this thread to the appropriate people for the Fiddler Documentation.
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