Windows 10: Small duplicate window opens when I start Edge...how to close smaller one?

When I opened Windows 10 this AM and clicked on EDGE, the browser opened as usual but there was a duplicate small screen in the corner, taking up screen space. How do I get full screen with only ONE window open?

:)

 

Microsoft Edge keeps on closing after a few seconds of opening it

Edge is Awesome for Browsing. Seems like this is a problem that many users are facing.
Do this: Disconnect your Internet and follow these steps

Steps: Microsoft Edge Closes Immediately after opening - Solved | Fix Errors

 

Small duplicate screen in Microsoft edge window

I have a small duplicate screen on my Microsoft edge screen. How do I get rid of it? Does this mean I have a virus? my window version is 1803

 

Win-10 Edge closes immediately after opening


My upgrade from Win-7 to Win-10 seemed to go faultlessly, everything including Edge worked correctly. After a couple of hours though, Edge no longer will open properly, The basic blue screen w/logo comes up for 5 seconds or so and immediately closes. Shortly thereafter the Start button also stopped opening, although by right-clicking I could get the basic function list so could still stumble along.
The Start button problem was fixed by going back to my first Restore point (created by an automatic upgrade), but the Edge problem persists in spite of trying various fixes from posts dating back to the beta-test period. Obviously this is a problem that has existed from the early beta issues ... and it ain't fixed yet!! Any suggestions appreciated, because I note that Win-10 depends heavily on Web access via Edge.