This feature is seen from Microsoft Edge (Canary) version 86.0.570.0
As the title says, there is a new feature added in Microsoft Edge in which when you select the text, you will get an option to search the web and when you will click that option, a new tab will be opened and that selected text will be searched.
This feature currently works on bing.com but I think it would be added to all websites in the future and also can be improved a lot.
Keep developing the new great features for Microsoft Edge 