Landscape blog posts

Hi. I am using the free version of the Blogasm theme. Any blog posts I set to landscape do not fill two columns on the front page of my website, unlike they appear to do when I look at the demo for the theme.

This issue occurs for me in both Chrome and Firefox browsers and in both Windows 7 and 10.

Is there any other settings, other than selecting landscape for ‘Featured Image Type’ on the relevant blog post, that I need to be using to enable the wider column image to appear on my front page.

Thanks.