I'm using a template from a website, and every time a new chapter starts, 'Chapter 3' for example appears and its quite absurd. How do I edit this feature out of the code?
You are using
If you don't want to load
In both cases the table of contents is:
and the first page of the first chapter is:
As you can see, the full functionality of \chapter is preserved (you have the optional argument for an eventual different entry in the ToC and headers and also marks are appropriately generated).
Another option would be to patch the command with the help of, for example,
The following addition using
One advantage is that it still allows for a different ToC entry for each chapter using