MajorGeeks published a tutorial about how to uninstall the new Edge browser if the uninstall button is grayed out.

How to Uninstall Microsoft Edge Browser if Uninstall is Grayed Out

Beginning in late June, Microsoft began pushing the Chromium-based Microsoft Edge to Windows 10. The update is delivered with KB4559309, and once installed, the Chromium-based Edge replaces the old Edge, and the Uninstall button is light gray and can't be clicked.

How to Uninstall Microsoft Edge Browser if Uninstall is Grayed Out - MajorGeeks