PyQt5 Small buttons. How to fix?

Question

PyQt

Made a calculator interface in Qt Designer. I converted it to Python with the command:
pyuic5 -x calc.ui -o main.py

Why are the buttons in Python so small and how to fix it?

Answer 1

resize window

Answer 2

def main_gui(args: argparse.Namespace):
    QApplication.setAttribute(Qt.AA_EnableHighDpiScaling)

Answer 3

if __name__ == "__main__":    
//перед созданием обьекта класа QApplication
QtWidgets.QApplication.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling, True)

//потом уже обьект

app = QtWidgets.QApplication(sys.argv)