Hi, I am one of the authors of the Adobe Photoshop Classroom in a Book. You are right, there is a difference between the Photoshop 2019 edition of the book and the current version of Adobe Camera Raw.
When the 2020 edition of Photoshop Classroom in a Book was released, it was written for the version of Photoshop that was released at Adobe MAX in 2019 (Photoshop 2020). At that time, Adobe Camera Raw was at version 12.
In June 2020, Adobe released Adobe Camera Raw 12.3, where they completely redesigned Adobe Camera Raw for the first time in many years. Suddenly the software no longer matched what’s in the book. The book is typically updated on a regular basis to keep up with the changes in Photoshop and Camera Raw, so the Camera Raw chapter can be expected to match the software again in a future edition, which is not yet available or announced.
I know that is not helpful for the Camera Raw chapter in the edition of the book that you have, but this change caught us between editions and I apologize for the inconvenience in the meantime. For now, one place to become familiar with the new Camera Raw is this tutorial from f64 Academy: