For information on how to turn off Microsoft Edge in case it keeps launching automatically, make sure to investigate Windows startup and Edge's background settings. Go to Settings > Apps > Startup and disable Microsoft Edge if it is there. After that, launch Edge, go to it, and disable Startup Boost and background apps if these settings are present. If Windows continues to restore Edge after signing in, check Settings > Accounts > Sign-in options and disable the feature for saving and restoring apps. Another thing that you can do is change the default browser. This way, you will not have any issues with unnecessary startup, but you will still be able to use Edge.