Can I leave a window on the back wall of the shop, and will it affect my fortune?

What does the shop look like? If not. It won't happen again. Don't change it at will. If so, why not? If you think it will affect your feng shui, you can hang a picture or something. It is not impossible to stop him. I think Liu Zhangzi's purpose is lighting and ventilation. Feng Shui is nothing special, if you think that window was lost by Liu Cai. Then you can seal it up and block it with something. Blocking is not impossible, the key is to look at yourself. As long as there is no doubt in your mind and your store has a good income. There's nothing. Don't worry about this anymore. After all, as long as you can run your own shop well, what should you rely on? Look at the quality of products, your marketing methods and your service attitude. If your service attitude is not good, even if there are windows in the back, Feng Shui will affect you. It's also big, if you have a good attitude, even if there are no windows and glass in the back. You still make money, so the key is how you run your own business, not Feng Shui.