https://www.bleepingcomputer.com/news/microsoft/how-to-block-windows-10-update-force-installing-the-new-edge-browser/

When Microsoft Edge reaches general availability in January, Microsoft has stated that the browser will automatically be installed on Windows 10 devices via Windows Update.

On January 15th, 2020, Microsoft plans on officially releasing the new Microsoft Edge browser and has decided to push it out via Windows Update rather than having it be a manual download.