I have the following method which establishes a QVBoxLayout with several configuration widgets:

def ConfigureNewGraph(self):
        confWnd = QWidget()
        confWndLayout = QVBoxLayout()
        confWnd.setLayout(confWndLayout)

        xAxisLabel = QLineEdit()
        xAxisRange = QLineEdit()
        yAxisLabel = QLineEdit()
        yAxisRange = QLineEdit()
        graphTitle = QLineEdit()
        
        #Group box as selector for the input type: via file or via port. 
        dataStreamBox = QGroupBox("Input type")
        serialPortCheck = QCheckBox("Serial port")
        textFileCheck = QCheckBox("File")
        dataStreamLayout = QFormLayout()
        dataStreamLayout.addWidget(serialPortCheck)
        dataStreamLayout.addWidget(textFileCheck)
        dataStreamBox.setLayout(dataStreamLayout)
        confWndLayout.addWidget(dataStreamBox)
        
        #Serial port input handler
        serialConfig = SerialConfig() 
        dataStreamLayout.addWidget(serialConfig.serialBox)
         
        #File input handler
        fileConfig = FileConfig()
        dataStreamLayout.addWidget(fileConfig.fileBox)
        
        #Widget to configure plot info
        plotInfoBox = QGroupBox("Plot information")
        plotInfoLayout = QFormLayout()
        plotInfoLayout.addRow("Plot title: ",graphTitle)
        plotInfoLayout.addRow("x axis label: ",xAxisLabel)
        plotInfoLayout.addRow("x axis range:",xAxisRange)
        plotInfoLayout.addRow("y axis label: ",yAxisLabel)
        plotInfoLayout.addRow("y axis range:",yAxisRange)
        plotInfoBox.setLayout(plotInfoLayout)
        
        confWndLayout.addWidget(plotInfoBox)
        
        serialPortCheck.toggled.connect(lambda checked: serialConfig.serialBox.setVisible(checked))#Shows the portBox 
        serialConfig.connectButton.clicked.connect(lambda: sc.ConnectToPort(serialConfig.baudRateInput.text(),serialConfig.portInput.text(),serialConfig.dataSizeInput.text(),serialConfig.connectionState))
        
        textFileCheck.toggled.connect(lambda checked: fileConfig.fileBox.setVisible(checked))#Shows the fileBox
        
        self.mainLayout.addWidget(confWnd)

And here is the class that implements the behavior for the SerialPort configuration:

class SerialConfig():
    def __init__(self):
        #Serial port configuration, can be expanded
        self.serialBox = QGroupBox()
        self.serialBoxLayout = QVBoxLayout()
        
        self.portInput = QLineEdit()
        self.baudRateInput = QLineEdit()
        self.dataSizeInput = QLineEdit()
        self.connectionStateLabel = QLabel("Connection status")
            
        #self.connectionStateWidget
        self.connectionState = QTextEdit()
        self.connectionState.setReadOnly(True)
        self.connectionState.setFixedSize(350,80)
        
        self.serialInfoWidget = QWidget()
        self.serialInfoLayout = QFormLayout()
        self.serialInfoWidget.setLayout(self.serialInfoLayout)
        self.serialInfoLayout.addRow("Port:",self.portInput)
        self.serialInfoLayout.addRow("Baud rate:",self.baudRateInput)
        self.serialInfoLayout.addRow("Size of data package (in bytes):",self.dataSizeInput)
        
        
        self.connectButton = QPushButton("Connect")
        

        #Layout order
        self.serialBoxLayout.addWidget(self.serialInfoWidget)
        self.serialBoxLayout.addWidget(self.connectButton)
        self.serialBoxLayout.addWidget(self.connectionStateLabel)
        self.serialBoxLayout.addWidget(self.connectionState)
        
        
        self.serialBox.setLayout(self.serialBoxLayout)
        self.serialBox.setVisible(False)

This is how it looks on the default size (QSize(800,600)) after running the application:

And this is how it looks like after maxing the window:

Is there any way to keep the distances within widgets when I resize my window?

I’m quite new to PyQt so any other comment is welcome. Thank you!