Microsoft Edge Beta update adds new tracking prevention feature and new favorites button. New sign-in and sync sync features are added to the latest Microsoft Edge build. Microsoft Edge beta also comes with issues affecting the Settings menu and Feedback button. Users are reporting problems with the Symantec Endpoint Protection software suite. Some users are reporting that after updating to the 78.0.276.276-276.8 build, the issue also affecting internal browser links such as edge://help and edge://version.html.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-enables-tracking-prevention-by-default-in-new-edge-beta/