https://www.bleepingcomputer.com/news/microsoft/microsoft-replaces-edge-legacy-in-latest-windows-10-dev-build/ > Microsoft has started replacing the legacy version of the Edge browser with the new Chromium-based Edge in Windows 10 Dev builds. > This change is rolling out to all customers installing Windows 10 Insider Preview Build 21313, offered through the Dev Channel and available after joining the Windows 10 Insider Program.