Hi, I’m using the Alves theme and I didn’t change the width of the parent containers/divs. When I select cover image in the builder, the image doesn’t cover the width of the page, like it does in the sample.
I’m afraid that, your site is not hosted with WordPress.com. It is a site using the open-source WordPress software (from WordPress.org) but hosted with Bluehost.
Because WordPress.com and WordPress.org are two entirely separate entities, we cannot access files or data for sites that are hosted elsewhere, so WordPress.com staff can only assist with sites that are hosted on our servers. You can read more about the differences between WordPress.org software and WordPress.com here: https://en.support.wordpress.com/com-vs-org/