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 Vocal Remover option, then the processing will start immediately.

Your music will be divided into two audio files, Vocal and BGM. They will be added to the Media section and downloaded to your computer.

These two audio files will also automatically replace the original song on the timeline, and you can choose which one to keep.