When i rename index.md to _index.md
a list of articles ( chapters ) are displayed I want to display only the content of _index.md without overwriting the list file of articles in the parent folder ( books ) is there a solution?
You have to change the layout. By default, it’s using the list layout. Either change layouts/_default/list.html, or layouts/mybook/list.html, or set layout: "foo" in _index.md and then define layouts/_default/foo.html.