Microsoft ECC Root Certificate Authority 2017

Control (right) click on it in the List and select Delete.

Yes, likely, if you want to delete it... Wait, this no longer seems to work‽

Instructions for MacOS

1. From the Finder, navigate to the Utilities directory, which can be found in the Application directory (or you can use the keys Shift + Command + U).
2. Open the application KeyChain Access, and select the Keychain System Roots from the sidebar.
3. Double-click the root certificate that you want to remove.
4. From the details windows that opens, choose never trust as setting for When using this certificate under the trust settings.

Did you at one time have MS Office or such on your Mac?