I can't answer your actual question, but have a follow-up one for you that may make your own question irrelevant: Do you ever want Edge (or any web browser you happen to use) to be remembering your passwords for you?
If not, this feature can be turned off entirely, and I can tell you how to do that. But if you do want to use the password management feature I don't know of the top of my head how one throws focus to that specific dialog when it appears.
Brian - Windows 10 Pro, 64-Bit, Version 20H2, Build 19042
[Regarding the Supreme Court refusing to hear the case brought by Texas to overturn the votes certified by 4 states:] Pleased with the SCOTUS ruling, but also immediately slightly terrified of where this crazy train goes next. We should know by now there’s a bottomless supply of crazy.
~ Brendan Buck, former adviser to Speakers of the House Paul Ryan and John Boehner