What are the measurements from bulkhead, not including tv alcove, to the sliding door opposite?

Need to look at the whole dining room too. Can you post plan that includes that space and dimensions. How many seats in each room do you want and what other furniture. Tv, buffet etc?

So the family room from bulkhead is 3660 to the sliding doors.

Only definite furniture would be dining table to seat 6 in dining space, some form of coffee table and built in TV unit in bulkhead space. No furniture is purchased at this stage, it's a blank canvas.

I would prob have couch backing onto dining with a console table behind the couch. It is not a big living space and entry needs to be maintained around the corner that meets kitchen with sliding doors opening. Some seating will need to be in front of windows since you have the tv on only wall

The space is not big, and you have a walkway out to alfresco. I would place a three seater couch approx 2000mm from bulkhead. Then single lounge chairs either side of lounge. Keeping all furniture at least 800mm from window and sliding door. Because the dining room area is a thoroughfare also, and not that wide or long, I would have a round table.

Something like this.

Importantly you need to purchase appropriate sized furniture for the space. Set outs similar to these photos, with appropriate sized furniture would also work. Unfortunately, if you want furniture, it has to be placed in the front of windows. Not against the window, about 800mm away.

Sorry, just to clarify (because I knew the layout in my head, but didn’t explain) this is how I would place furniture in your room with a corner sofa.

to make the room feel as spacious as possible, considering entry points, windows and flow through really you only have room for one appropriately scaled/sized couch positioned in the middle of the space facing the TV. A a rule work to min. 1m clearance around all furniture, a bit more for seating to a table, to comfortably move around it. Whilst you could push a lounge hard to the window with either a corner or chaise lounge or separate chair it will feel like you've crammed the room full of furniture. So best you balance the longest couch centralised to the TV recess depending upon dining table shape/scale, which probably will work best being a round table as per @dreamer has suggested. You could possibly have a feature chair backing onto the window if it was a light/swivel base so you look through it more as opposed to a bulkier design