This varies by distributor, but in most cases, you will just need to reach out your account representative at your distributor and request removal of the song from YouTube's Content ID within their system. They are usually able to process this request within 2 weeks.
If you are not sure how to opt-out of Content ID from your distributor, please reach out to firstname.lastname@example.org and they will provide you with guidance on how to do this.
**Please note that while your song is opted into Thematic's content ID you cannot opt it back in with your distributor or any other distributor as this will cause a conflict.**