This state is sometimes called the fictional daydream or, in German, Kopfkino, literally “cinema in the head”.
The challenge for the writer is writing five words that will ‘hook’ or immerse the reader in the story. Then keeping the reader immersed. Entire books have been written on how to do this and “Deep Point of View” so I won’t try to cover all of that here. Your editor will work with you to assist you in this.
However, I thought it was fascinating to read about what happens when readers read here: https://lithub.com/what-does-immersing-yourself-in-a-book-do-to-your-brain/