Pyqtgraph 绘制曲线的左下角的 A 按钮怎么去掉？

        Form.resize(820, 454)
        Form.setObjectName("Form")
        historyLength=1800
        self.graphicsView = PlotWidget(Form)
        self.graphicsView.setGeometry(QtCore.QRect(10, 10, 261, 121))
        self.graphicsView.setObjectName("graphicsView")

        self.graphicsView.setLabel(axis="left",text='sEMG Voltage')
        self.graphicsView.setLabel(axis='bottom',text='Time')
        self.graphicsView.setMouseEnabled(x=False,y=False)
        self.graphicsView.setAntialiasing(True)
        self.graphicsView.enableMouse(False)
        self.data1 = np.random.normal(size=1800)
        self.curve2 = self.graphicsView.plot(self.data1)
        self.ptr1 = 0

        def update1():
            global data1, ptr1
            self.graphicsView.setRange(xRange=[self.ptr1,self.ptr1+historyLength],yRange=[0,500],padding=0)
            self.data1[:-1] = self.data1[1:]  # shift data in the array one sample left

            self.data1[-1] = random.uniform(0,500)

            self.ptr1 += 1
            self.curve2.setData(self.data1)
            self.curve2.setPos(self.ptr1, 0)

        self.timer = pg.QtCore.QTimer()
        self.timer.timeout.connect(update1)
        self.timer.start(10)

设置了 buttonsHidden = True 还是去不掉