Just installed 2.0, so now have both that and 1,8.19. I have both pinned to my Win 10 taskbar.
In 1.8, when a sketch is open an additonal underlined icon conveniently appears at the right of the other taskbar icons. More appear when more sketches are opened. Behaviour is different with 2.0. Its single icon does get underlined, but it's not as prominent an indication. By design?