Your question is, is it taboo for the window to face the balcony after the two rooms are connected?
So I personally don't think this is taboo. Don't worry, then the window facing the balcony is taboo. Don't worry.
Generally speaking, if the other party has, for example, how do you face your own door? For example, it's not very good, such as the other person's toilet, facing his own door, and the other person? For example, the corner of the other side is right, your door.
What about this situation? It's really a bit unfavorable, so there seems to be a saying in Feng Shui, so who thinks that your window faces the balcony? Don't worry, don't worry and remember, this feng shui is very good, it doesn't matter.
The above are personal answers to your questions. I hope they can help you and you can adopt them.
Finally, I wish you health, happiness, good luck and all the best.