Microsoft is currently working on a new privacy feature for the Chromium powered Microsoft Edge browser, that will allow you to show or hide the "Reveal Password" button next to the password fields. When you have a privacy concern, you should hide the button by simply turning OFF a settings.
The feature is currently rolling out to Edge Insiders, running the Canary build 87.0.666.0 or higher. To learn how to disable the "Reveal Password" button in Microsoft Edge, continue reading further.