What you're showing is covered windows. Is that the standard condition? If it is, you are taking the windows out of play. Put whatever you need , sofa, sectional, tv anything. As if it was a wall. If you use top-down bottom-up segmented shades on the windows you can open segments between furniture placements. It depends on the view you have to work with, if any.

Take pictures pf the entire room and post them in this dilemma. Right now it is hard to make sense with all the small rugs around. It looks like seating would face the back of seating so that makes no sense without more pictures.

This is a picture from dining room into the main room. Yes, dog kennel has to stay.

This is a picture from dining room into the main room. Yes, dog kennel has to stay.

You need to post more photos of your home in order for people to understand the entire layout of this area. Without photos (a scaled sketch would be even more helpful), no one will understand how the entire area is being used in order to propose what to put in front of the windows.

These shades are open during the day.

How about a pic from the middle of the windows looking across the room?

Unless you feel that the seating are does not provide enough seating, I wouldn’t be looking to just fill up the space.