How to get the geometry of the screen on which the app is started

[rstamm.dev]

Hi,

#include "mainwindow.h"

#include <QDebug>
#include <QScreen>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{

    qDebug() << screen()->availableGeometry();

    resize(screen()->availableGeometry().width() * 2/3, screen()->availableGeometry().height() * 2/3);
    move((screen()->availableGeometry().width() - width()) / 2, (screen()->availableGeometry().height() - height()) / 2);

}

MainWindow::~MainWindow() {}

When I start the app on the external monitor, I get the geometry of the notebook display.
How do I get the geometry of the screen on which the app is started?

Setup is Arch, Wayland, and KDE on a notebook(FullHD, secondary) with an external monitor(QHD, primary display)

Thanks

[ChrisW67]

Is QGuiApplication::primaryScreen() useful?