Why does QT eat elements when the window is reduced?

Question

Qt

Tell me why the kite eats the widget. It does not touch standard widgets, but my widget, which is dynamically formed from a form via quiloader, is somehow chewed up by the window. The window can be shrunk so that the area with dynamic widgets will be shrunk to 0. Pictures are attached.
Window wide :
Window reduced:

Answer 1

Probably because the elements are not added to the appropriate layout.

Answer 2

You may need to set a minimum widget size.

Answer 3

Your GroupBoxes are bound, but the Labels are not, so you need to bind them in the same way as the GroupBox