I didn't even get that far. When I clicked Search I got no results and got a message in a scary, red banner that says "To see results and get the convenience of you.com, you’ll need to add the you.com Chrome extension".

I'm not even using Chrome. But I guess Vivaldi masquerades as Chrome to websites. Whatever, doesn't matter. I shouldn't have to install a browser extension to use a search engine. Bye, bye.