How to add a widget to a parent?

Question

Qt

There is a task to add a widget to the parent. I call this->parent(), but I can't use addWidget anymore. The debugger says QWidget(0x55fde723f050, name = "verticalLayoutWidget") is returned. Finds really right. But how do you add it?

Answer 1

Go even higher and look for the layout that lies in the parent.