When I used https://www.google.com/#q=windows+edge+does+not+keep+screen+position I found I had no new ideas.
Windows 10 will hold all my apps in position when I close and reopen. With the exception of Windows Edge. When I close the app, it will reopen maximized and when I minimize the app, it goes where it wants to. How do I get it to adjust as all other apps?

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