My shop is in a shopping mall. The door is facing the north gate of the shopping mall. Outside the door is a large horizontal underground passage. I also want to open all the doors for fear of bad feng shui.

I am not a master, but I have read a lot of Feng Shui books. If there are no windows facing the door in your shop, you will not lose money. According to Feng Shui, if there is a window or balcony on the opposite side of the door forming a straight line, and if it is transparent from front to back, it will leak money. Also, the front of your shop is facing the gate. Outside the gate is a horizontal underground passage, which should be parallel to your shop door. As long as it is not perpendicular to the gate, there will be no road collision, and it will be fine.