Hi, not running Edge, but from your screenshot it should be ok to allow it.
I'm not running Edge either.
Shouldn't there be another option in this alert/notification, e.g. report to Avast so that it isn't falsely reported, e.g. not causing concern to the user if this is a valid function in Edge. Given that all browsers with the ability to save login details, why wouldn't all browser that do this be pinged.
Presumably the msedge.exe should be digitally signed by MS ?