nothing happened because you did not set the layout anywhere. just create one QWidget and set the layout to it and then add that widget (which will contain your 2 widgets) to the toolbar, instead of adding your 2 widgets separately.
// remove these 2 lines
//ui.editToolBar->insertWidget(ui.action_Ricerca, lblRicerca);
//ui.editToolBar->insertWidget(ui.action_Ricerca, ricData);
. . .
widget->setLayout(vLayout);
ui.editToolBar->insertWidget(ui.action_Ricerca, widget);
// remove these 2 lines
//ui.editToolBar->insertWidget(ui.action_Ricerca, lblRicerca);
//ui.editToolBar->insertWidget(ui.action_Ricerca, ricData);
. . .
QWidget *widget = new QWidget;
widget->setLayout(vLayout);
ui.editToolBar->insertWidget(ui.action_Ricerca, widget);
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