Audio:
Click on your audio track on the timeline, then you can find the Magic AI icon in the toolbar above. Click it, and you'll see Reduce Noise option.
Video:
Click on your video on the canvas, then you can find Audio Settings in the toolbar above. Click it, and you'll see Reduce Noise option.
The noise-reduced audio file with the "Reduce Noise_" prefix will be added to the Media section and downloaded to your computer. And it will directly replace the original audio on the timeline.
After the video is denoised, the audio will be separated, the original video will become audio-free, and the denoised audio will be displayed in the timeline.