[Bradles]

I have never used a GridLayout before, but I think a HBoxLayout in a VBoxLayout and a stretch on the end would do the trick. I'm no expert by any means.

Here's one I prepared earlier ;-):

Spoiler:

LABEL_WIDTH = 100
class ConfigWidget(QWidget):

    def __init__(self):

        QWidget.__init__(self)

        self.l = QVBoxLayout()
        self.setLayout(self.l)

        groupBox = QGroupBox(_("OpenAI API"))
        self.l.addWidget(groupBox)

        groupBox_vlayout = QVBoxLayout()
        groupBox.setLayout (groupBox_vlayout)


        # # # API URL # # #
        # H Layout
        apilayout = QHBoxLayout()
        groupBox_vlayout.addLayout(apilayout)

        # API label
        apilabel = QLabel(_('API &URL:'))
        apilabel.setMinimumWidth(LABEL_WIDTH)
        apilayout.addWidget(apilabel)

        # API edit
        self.apiedit = QLineEdit(self)
        self.apiedit.setText(prefs['api-url'])
        self.apiedit.setToolTip(_("This is the proxy to the backend API. You do not need to change this."))
        apilayout.addWidget(self.apiedit)
        apilabel.setBuddy(self.apiedit)
        apilabel.setToolTip(self.apiedit.toolTip())
        self.apiedit.setEnabled(False)


        # # # LANGUAGE # # #
        # H Layout
        langlayout = QHBoxLayout()
        groupBox_vlayout.addLayout(langlayout)

        # Language label
        langlabel = QLabel(_('&Language:'))
        langlabel.setMinimumWidth(LABEL_WIDTH)
        langlayout.addWidget(langlabel)

        # Language edit
        self.langedit = QLineEdit(self)
        self.langedit.setText(prefs['language'])
        self.langedit.setToolTip(_("The language in which to return results, e.g. English, Spanish, German, Klingon..."))
        langlayout.addWidget(self.langedit)
        langlabel.setBuddy(self.langedit)
        langlabel.setToolTip(self.langedit.toolTip())


        # # # MAX TOKENS # # #
        # H Layout
        maxlayout = QHBoxLayout()
        groupBox_vlayout.addLayout(maxlayout)

        # Max Length label
        maxtokenslabel = QLabel(_('&Max length:'))
        maxtokenslabel.setMinimumWidth(LABEL_WIDTH)
        maxlayout.addWidget(maxtokenslabel)

        # Max Length edit
        self.maxlength = QLineEdit(self)
        validator = QIntValidator(1, 2000, self)
        # the  lineedit SHOULD only accept integers between 1 and 2000, but actually accepts 9999!
        self.maxlength.setValidator(validator)
        self.maxlength.setText(prefs['max-length'])
        self.maxlength.setToolTip(_("The maximum length in tokens, where 1000 tokens is about 750 words."))
        maxlayout.addWidget(self.maxlength)
        maxtokenslabel.setBuddy(self.maxlength)        
        maxtokenslabel.setToolTip(self.maxlength.toolTip())


        # # # TEMPERATURE # # #
        # H Layout
        templayout = QHBoxLayout()
        groupBox_vlayout.addLayout(templayout)

        # Temperature label
        templabel = QLabel(_('&Temperature:'))
        templabel.setMinimumWidth(LABEL_WIDTH)
        templayout.addWidget(templabel)

        # Temperature slider (save as float in range 0.00:2.00)
        self.tempslider = QSlider(self)
        self.tempslider.setOrientation(Qt.Horizontal)
        self.tempslider.setMinimum(0)
        self.tempslider.setMaximum(200)
        self.tempslider.setToolTip(_("Control the randomness of results, where lower numbers are less random."))
        templayout.addWidget(self.tempslider)
        templabel.setBuddy(self.tempslider)        
        templabel.setToolTip(self.tempslider.toolTip())

        # Temperature value (updated in response to slider changing)
        self.tempvalue = QLabel()
        templayout.addWidget(self.tempvalue)

        # make sure above layouts align to the top
        groupBox_vlayout.addStretch()

        # do this last so tempvalue is ready to go
        self.tempslider.valueChanged.connect(self.temp_value_changed)
        self.tempslider.setValue(int(100 * float(prefs['temperature'])))