My Vivaldi has a brownish border, which I don't remember ever to have changed. Apart from that, I have my tabs on the left side, which I like more and more.

>I'm not sure Vivaldi is fast than Edge.
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>I'm trying out Vivaldi again. In fact, posting this from it. There are some things I don't like about it. The default red toolbar/borders is very abrasive. Current user install puts the bits in the wrong folder. Install should not put shortcut on desktop. I just installed it today so the list could change.
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>>I rarely use Edge myself, I prefer Vivaldi for its speed and simplicity. I guess it's your choice, if you absolutely must use Edge. Maybe it's a setting on your machine that's different from mine?