Removing Full Width from a specific Post Page

Hi, I am using a real estate plugin with Advertica Lite, that adds properties (listings) as a post.

It displays the Property advertised (only this single post(s) (listing(s)) this post as a full width screen and not a default template, so I can’t add widgets to the sidebar, apart from that, it warps the images to accommodate for the wide view which sometimes looks awful.

This only happens in the plugin’s posts, not any pages or posts as it allows me to simply select Full Width or Default Template which I can then edit as needed.

I know it has nothing to do with the plugin as a lot of other themes including WordPress 2015 works 100% fine.

Can you accommodate, I know it is a free theme but as my website grows, so will my need for more features (Pro)

Let me know, I have tried page builder, some coding, etc, etc but I try not to bother too much with coding as I don’t want to break the theme and then something else is out of place elsewhere and then leading to a string of errors… it just seems completely locked… I would like to fix it the right way so that I don’t have to fix other things within the site..

Looking forward to your response.

Thanks