Resizing of border line of software (Page 2 of 3)

/**
    Constructeur
    @param parent QWidget parent
*/
ConfigDialog::ConfigDialog(QWidget *parent) : QDialog(parent) {
 
    // liste des pages
    pages_list = new QListWidget();
    pages_list -> setViewMode(QListView::IconMode);
    pages_list -> setIconSize(QSize(128, 128));
    pages_list -> setMovement(QListView::Static);
    pages_list -> setMinimumWidth(168);
    pages_list -> setMaximumWidth(168);
    pages_list -> setSpacing(16);
    pages_list -> setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    // pages
    pages_widget = new QStackedWidget();
    // boutons
    buttons = new QDialogButtonBox(
                QDialogButtonBox::Ok
                |QDialogButtonBox::Cancel);
 
    //
    QScrollArea *scroll = new QScrollArea(this);
    scroll->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
    scroll->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 
    QWidget *viewport = new QWidget(this);
    scroll->setWidget(viewport);
    scroll->setWidgetResizable(true);
 
    // layouts
    QHBoxLayout *hlayout1 = new QHBoxLayout(viewport);
    // add needed widgets to layout "hlayout1"
    hlayout1 -> addWidget(pages_list);
    hlayout1 -> addWidget(pages_widget);
 
    //add hlayout1 to widget
    viewport->setLayout(hlayout1);
 
    // Add a layout for QDialog
    QVBoxLayout *dialog_layout = new QVBoxLayout(this);
    dialog_layout->addWidget(scroll); // add scroll to the QDialog's layout
    dialog_layout -> addWidget(buttons);
    setLayout(dialog_layout);
 
    // connexion signaux / slots
    connect(buttons, SIGNAL(accepted()), this, SLOT(applyConf()));
    connect(buttons, SIGNAL(rejected()), this, SLOT(reject()));
    connect(pages_list, SIGNAL(currentRowChanged(int)),
        pages_widget, SLOT(setCurrentIndex(int)));
 
    Machine_info *mymachineinfo= new Machine_info(this);
    resize(mymachineinfo->get_max_screen_width(),
           mymachineinfo->get_max_screen_height());
 
#ifdef Q_OS_MACOS
    if (parent) {
        setWindowFlags(Qt::Sheet);
    }
#endif
}

git fetch https://github.com/De-Backer/qelectrotech-source-mirror.git master
git log FETCH_HEAD

QElectroTech V 0.80-DEV
Compilation : GCC 10.1.0
Built with Qt 5.9.5 - Date : Jul 24 2020 : 07:25:48 
Run with Qt 5.9.5 using 6 thread(s)
CPU : model name : Intel(R) Core(TM) i5-8400 CPU @ 2.80GHz 
RAM Total : 7801 MB
RAM Available : 5468 MB
GPU : Intel Corporation Device 3e92 
OS : linux - x86_64 - Version : Ubuntu 18.04.4 LTS - Kernel : 5.3.0-51-generic
*** Qt screens *** 
( 1 : 1920 x 1080 ) 
( 2 : 1920 x 1080 ) 

setMaximumSize(mymachineinfo->i_max_screen_width(),
               mymachineinfo->i_max_screen_height());
    resize(1400,1000);