Consult a feng shui expert

The window cannot be sealed. You can put a smooth stone behind them.

About windows, people are the center. There is nothing to worry about. As long as you sleep energetic.

People-oriented, which is rarely known in Feng Shui, is actually wrong in the calculation of Feng Shui position, which room is suitable for living, which side is the head and so on.

As for the direction of your sitting posture, this problem is mainly the theory of gathering energy by hiding wind. Look at the basic questions in your introduction. Don't worry, no problem.