Edit: Looks like you can opt-out of that “new look and feel” pretty easily under the appearance settings but still, whats with putting rounded corners everywhere?
Edit 2: “Explore the web with a softer, more friendly aesthetic featuring rounded corners […] Designed to complement your operating system, whether on Windows 11, MacOS, or Linux.” The fuck does that mean? Windows 11 fair enough but most Linux distros don’t look like that at all.
Edge is copying a lot of stuff from the yet-to-be-released-on-Windows arc browser. This is one of them. They seem to have not added the other stuff that interfaces with it like the one window split screen.
The latest Edge update does have a split screen option.