Hmmm...I wonder if that's something you would have to deliberately do. In Witcher 3, the world was so huge and engrossing that, just by exploring and participating in it, I outleveled quests, and had a very hard time catching my quests and world progression up to my power even when I tried to. Enabling enemies to scale to my level wasn't the best solution, since it just meant that instead of everything being easy, everything became equally hard.