Thanks for the replies, guys. I don't think the problem is virus-caused, because I had re-installed W10 some time ago because of a different situation and Edge browser behaved the same way from the get go. Scans with Malwarebytes and Bitdefender have revealed no infection.You know, it's not worth being concerned about. I use 3 other browsers (Chrome, Firefox & Opera), so there's no need for Edge.
Neemobeer, I tried your suggestion but couldn't find a way to use compatibility mode. Anyway, it's a moot point now. You guys are always helpful. Thanks again.