Qt 6.2.1 Android app is rendered on lower resolution ant then scaled up. Can this be disabled?

[EMC3]

I just found out that
qDebug() << "Window size: "<<this->width()<<" "<<this->height();
gives me 943x410, wich is about 0.4 times the resolution of my device. The application rendered by QT on this lower resolution is then somehow scaled up and displayed in full screen.

How can this be disabled to use the devices native resolution?