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Source Code:

import sys
from PyQt6.QtWidgets import QApplication, QWidget, QLineEdit, \
                            QHBoxLayout, QVBoxLayout
from PyQt6.QtCore import Qt


class MyApp(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle('Auto Convert Text To Proper Case')
        self.window_width, self.window_height = 700, 100
        self.resize(self.window_width, self.window_height)

        self.layout = QVBoxLayout()
        self.setLayout(self.layout)

        self.input = QLineEdit()
        self.input.setPlaceholderText('Type Something')
        self.input.textChanged.connect(self.auto_convert_texts)
        self.layout.addWidget(self.input)

    def auto_convert_texts(self, txt):
        proper_case_text = txt.title()
        self.input.setText(proper_case_text)


if __name__ == '__main__':
    # don't auto scale when drag app to a different monitor.
    # QGuiApplication.setHighDpiScaleFactorRoundingPolicy(Qt.HighDpiScaleFactorRoundingPolicy.PassThrough)
    
    app = QApplication(sys.argv)
    app.setStyleSheet('''
        QWidget {
            font-size: 20px;
        }
    ''')
    
    myApp = MyApp()
    myApp.show()

    try:
        sys.exit(app.exec())
    except SystemExit:
        print('Closing Window...')