If you post the dimensions you will get a more accurate response. I'm not sure there is enough space to do 2 sofas facing each other as access to the sliding doors may be impeded. If so, then an L shaped sofa with a comfy chair to the right of the fireplace or 2 swivel lounge chairs flanking the fireplace with a 3 seat sofa opposite the fireplace would work. The second option would be my vote as a sectional may cut off the view and flow....however if there is enough space to do 2 sofas facing each other and you also have room for 2 lounge chairs either by the fireplace or opposite the FP - then that option allows for maximum seating and maximum napping potential. That would be my vote but you need at least 10' from the center line of the FP to the slider to consider that. I can show some simple layouts if you post the dimensions.

I would do two sofas facing each other with two smaller armchairs facing the FP. Just make sure the sofas aren't too deep. 36" max. Get a large coffee table to put between the sofas. If it's not too late, get an electrician to put outlets into the floor so you can either put lamps on the side tables or put a narrow console behind each sofa for a table lamp or two.

I would float two sofas in an L configuration, with room to walk behind the seating area. One facing the fireplace and one facing the view. If you want extra seating, you could add two low backed chairs or bench seating in front of the window.

Calidesign said exactly what I was going to mention. Seating facing your beautiful view and the fireplace with room to comfortably walk around them

I agree with the layout of 2 sofa's L config facing the lake and FP. I would also add the 2 lower chairs by the slider. The chandelier needs to come down lower. It would help define the LR space and make it more intimate. Although you have high ceilings, which is great, but making it more intimate and welcoming is the goal for living in them. There is no way you will distract from the beauty of the windows and the lake. From an aesthetic point of view, the chandelier will not win against Mother Nature. From the outside IN, it would be beautiful to see a chandelier at night. Functionally, however, it is lighting the second floor and the ceiling. If it's that bright to light the downstairs, then I can't imagine how bright it is upstairs where someone maybe trying to rest. I would drop it or consult a lighting expert as well (who will probably tell you the same thing) It can function better.