How to share only a child window, in a PyQt5 application, in video conferencing applications?

Question

PyQt

I need to make an application in PyQt5, which, when shared in video conferencing applications, its widget with a video stream was recognized as a separate window and only it could be shared.

I selected QDockWidget and made it floating. Made tracking of the main window move signals to move the QDockWidget child window after it. But I ran into a problem. When the parent window is moved off the edge of the screen, the child window does not go off the screen. This is a problem on Ubuntu, not on MacOS.

How do I allow the dock widget to go off screen, or use another widget altogether?