Sofa facing the railing with its bad to the three windows in the last pic, it's front in line with the left outermost edge of the fireplace. White chair on a diagonal in the center ,facing the sofa and left of the fireplace.

That might work I would discourage the chaise on the sectional just do an ottoman same sitting comfort but much nicer seating when you company. IMO thi s is ahuge space that is poorly laid out the DR table needs to be about 3x the size I would put it infront of the patio doors off the kitchen then you would have a huge LR with a couple of seating arragements one in front of the fireplace and one for T.V viewing all pieces that can be moved when you have a crowd.We have a large LR and I puposely bought piecs that could be rearranged for different looks and purposes like the Christmas tree for instance .So I have 2 sofas, a chairs that do not match the sofa or each other but work in the space a long bench that can be moved easily wherever I need it I really dislike sectionals because they are so site specific and in your space I think if possible think many useful pieces that can move easily .

Not a Pro. It's a tight space. I think you did a great job. Maybe just shifting everything a little closer to the fireplace may give you the room needed so you don't feel tight at the kitchen.

I recommend asking someone local that can observe the existing condition first hand that can effect the solution, and not rely on one drawing and minimal verbal description.