Click on your music on the timeline, or click on your video on the canvas, then find the Audio Settings option in the toolbar above.
On this panel, choose the Reduce Noise option, then the processing will start immediately.
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.