How to resize a widget inside my centralWidget()?

[gboelter]

Hello wysota,

Add a layout to your central widget if it doesn't have one and place your frame inside that layout.

that was my idea too, so I've tried it in many ways already but it don't work for me.

I have attached two screenshots.

For me it looks like, the centralWidget() has a layout. So I've tried this for example:

frameHome = new QWidget( myMainWindow->centralWidget() );
    setupUi( frameHome );

frameHome = new QWidget( myMainWindow->centralWidget() );
    setupUi( frameHome );

To copy to clipboard, switch view to plain text mode 

I can resize the centralWidget, but not the content inside the centralWidget.

I guess, I understand something totally wrong ....