My in-laws have a similar room layout to yours. Where your bar area is they have a built in entertainment center. The TV is on a stand that pulls out and swivels if they want to make it accessible to many viewers. There aren't doors in front of the TV to close it off while not in use, but there are glass front doors where the components are. They aren't big TV watchers, so this works for them. My son has a huge projection TV screen mounted to the ceiling in front of his fireplace and they just lower the screen (remote control) when they want to watch TV, but have it up most of the day. You don't even notice it up there on the ceiling and they can still use the fireplace with the screen down as it doesn't come down enough to block the fireplace. For this set up, you would have to have suitable spots for the projector and sound components. That's a super sweet set up, esp. if you're into movies. We love watching movies at his place. Also, you need to have blackout shades on the windows if you watch TV in the day. I like the concept of a small sitting area in the vicinity of the fireplace and another one facing the opposite wall-if you decide to put your TV opposite the fireplace. Wherever you place your system, it might be useful to have easy to move furniture, so if you have a big group conversing, playing games, watching TV, you can easily pick up and move your furniture to accommodate everyone. Very pretty room.

Sofa on long window wall will look and feel the best and make the room inviting when you walk into it from the front entry. TV on the short wall opposite the sofa; pay to have the wiring redone and move on......you cannot make the space bigger but you can make work well....PS what and where do the stairs go? Do you have an upstairs? What are the dimensions of the living/dining room and kitchen.

I would keep this basic arrangement with a few changes: 1. Whatever is in front of the fireplace needs to go. 2. Move the tree someplace other than this room. 3. Put the two red chairs together in front of the railing and send the recliner to another room. 4. Get matching floor to ceiling curtains for all windows in this space. 5. Get a rug large enough to hold all front feet of the sofa and chairs. 6. Replace the current console with a longer one that spans nearly the width from fireplace to wall and is no higher than the one you have now.

You do not give any measurements, and that makes it impossible to envision. Measure each wall in the room. Measure from a corner to door and window frames. Measure the width of the door and window openings. Draw out the measurements on paper so that one foot equals one inch. You don't have to use graph paper, but use a ruler to keep the scale accurate. Position the door and window openings as accurately as possible, and if a door opens into the room use a curved arrow to show which way it swings. When everything is drawn out look for obvious pathways. Since you describe this as spacious, there should be room to walk around furniture groupings. Next measure your furniture—sofa, chairs, tables, bookcases, TV, etc.—that you plan to use in this room. On a separate piece of paper draw the outlines of these pieces at the same one foot equals one inch scale. Label each furniture piece and cut it out. Now you can lay these furniture pieces on top of the room floor plan and move them around till you like what you see. Here is a picture of one room plan. As to where to put your TV, many people put it next to the fireplace so as to keep the focal point on that wall. If there is not enough room there choose another wall. Don't place the TV in front of a window, especially if you watch TV during the day, because the backlighting causes eye strain. All the guides I have recently read say the bottom 1/3 of the screen should be at eye level of a seated person. These guides also recommend sitting much closer than I would have thought, and that distance varies with the resolution of your set. For instance, a 40" 1080P HDTV is best viewed between 5' and 8.3' away, whereas a 40" 4K Ultra HD TV has optimum viewing between 3.3' and 5' away. Here is the link to that info. That seems ridiculously close to me. Should you have no suitable wall for the TV consider using furniture as a room divider to hold the TV as below.