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from PyQt5 import QtWidgets, QtGui

app = QtWidgets.QApplication([])

class Window(QtWidgets.QMainWindow):
    def __init__(self):
        super().__init__()
        self.setGeometry(600, 30, 800, 700)
        self.setFixedSize(800, 700)
        self.show()


class ScrollArea(QtWidgets.QScrollArea):
    def __init__(self):
        super().__init__()
        self.setGeometry(450, 50, 800, 650)
        self.show()


scroll = ScrollArea()
layout = QtWidgets.QVBoxLayout()
label = QtWidgets.QLabel("Да")
label.setFont(QtGui.QFont("Arial", 1800))
layout.addWidget(label)
scroll.setWidget(layout)

scroll.show()

app.exec()