How to remove the number in Table of Contents and in each chapter

[shoukewei]

I am writing a book using Jupyter book 2. When export it to pdf, it automatically added a number before the headers of each chapter and TOC. I did not find how to remove it, because I have chapter 1, 1.1 numbers, or it looks strange. Thank you for your help.

toc.pdf

[FreekPols]

Which template are you using? You can download the template, and change the settings.