A kitchen is the busiest place in the house. Unfortunately, it is also the most challenged room in terms of space. The large kitchen appliances, along with the dining set eat up a substantial space. You cannot do anything about it. But, you can certainly free the space occupied by a bulky dining set.
Large, semi circular banquettes look apt in spacious kitchens. You can add some chairs. Build the bench along the wall containing the window and set the chairs on the open space opposite the bench.