Preheat the oven to 400°. In a large bowl, whisk 1 tbsp. maple syrup, 1 tbsp. oil, and 1 tbsp. Dijon; season with salt and pepper. Toss with the carrots and potatoes. On a large baking sheet lined with parchment paper, arrange the vegetables in a single layer. Roast for 15 minutes.
Rub the fish with the remaining 1 tbsp. oil; season. Remove the baking sheet from the oven. Arrange the vegetables in an even layer on one side of the baking sheet; place the fish on the other side. Roast until the fish is cooked through, about 10 minutes.
In a small bowl, whisk the yogurt with the remaining 1 tbsp. maple syrup and 2 tsp. Dijon. Break the fish into large pieces. Divide the vegetables among plates. Top with the fish, yogurt mixture, dill, and a drizzle of oil. Serve with the orange wedges for squeezing.