Theme "The Brilliance" - Home Page issues

I have purchased “the Brilliance” theme. I wanted to use my Home page as in your Demo Home page number 5. Unfortunately when I am selecting the Home Page 5 in the customizer it shows a small page like we see in mobile pages. How can I see this page as we see other home pages like full width. And also the side bar appears to be behind the slider (top portion). Please advise. I would like to showcase the recent posts in the side bar. For reference my home page is;

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