Faced with such a problem. I linked my blender and PyQt6. We even managed to find an example of how to start the process without the main window of the blender hanging. However, when I started to complicate the design, namely! If I try to switch windows via QtWidgets.QStackedWidget(), then I can’t add the same switch. With grief in half, I found which part of the code is responsible for the part I need and entered it there