Go to Notifications. Select Microsoft Edge from the list. Remove the tick from Show notification on lock screen checkbox. First, you have to open the System Preferences window on your screen.

Disable Facebook notifications in Chrome and Edge By default, the browser alerts you whenever a website, app, or extension wants to send you notifications.

Turn off web notifications in Microsoft Edge (PC) Open up Edge on your computer and click on the three horizontal dots in the top right hand corner of the browser.