Qt Designer lacks the option "Layout Alignment" for QWidgets that contains a layout.

I'm referring to this option;

This option is visible when you right click a widget inside a layout.

But when you right click directly on the QWidget that has the layout this option is not visible,

and them i need to align the widget layout using code, for example: 

ui->widget->layout()->setAlignment(Qt::AlignTop | Qt::AlignLeft);