No sidebar for front index page

Hello...

I have the ClothingStore theme, which I really like. But one problem that I am having is that although I do want the sidebars on all the other pages, I want to remove it from the main index page only. However, there is no option for this. If I choose full-width, it makes the entire site full width. And if I choose to use the right sidebar, it makes the entire site have the right sidebar. Also, the only option it gives when creating a page is the default option.

Is there a way that I can create a for any given page to have a full width only?

Thank you!