KDP: How to set “Look Inside” text?

Does anyone know how to set a book up with “Look Inside” text on Amazon? I can’t figure it out.

 

Never mind, it appears that if you have a Kindle title, it gets automatically enrolled within a week of publication. I’ll report back with details once it has happened.

 

It's auto generated with the first 10% of the book. Sometimes it can take a few days for it to happen.
https://kdp.amazon.com/en_US/help/topic/G200644250

 

I’m hoping that once it’s generated, I can adjust how much is displayed. I’d like the first chapter to be the cutoff, which would be the perfect point to whet people’s appetite. We’ll see what happens with the auto-generation.

 

You have zero control over that. It will auto generate the first 10% of the book.

 

Note to self: arrange the next book so that 10% is exactly the amount you want to show in the preview text.