There are many reasons for noise. One is that the microphone turns on the sound enhancement function, which will cause noise. If the sound enhancement function is cancelled, there will be no noise. However, most microphones have no denoising function, and ordinary screen recording software has no denoising function, but some good screen recording software has denoising function. You can try QVE screen recording, which comes with silencing function and microphone sound enhancement function to eliminate noise perfectly.
Enter Settings, click Applications and Services, then click Application Management, then click the small triangle in the upper left corner to display all applications, then search for "screen recording" in the search box, click again, click Forced Stop, and finally drop down the control center and click Screen Recording, which should be enough. I just called the customer service to solve the problem. It is estimated that the screen recording app has just been restarted.