We are requesting automatic scaling during initialization of the Qt UI: https://github.com/libyui/libyui/blob/master/libyui-qt/src/YQUI.cc#L159 QApplication::setAttribute(Qt::AA_EnableHighDpiScaling); according to https://doc-snapshots.qt.io/qt5-5.15/highdpi.html#high-dpi-support-in-qt "The Qt::AA_EnableHighDpiScaling application attribute, introduced in Qt 5.6, enables automatic scaling based on the monitor's pixel density."