Is there a way to do this? Currently, website previews (such as when linking on Facebook) use the slider image as the preview. I’d like to set a custom image for website preview using a Featured Image, however cannot find a method of assigning a featured image to the presentation page?
The presentation page is not a static page. In Nirvana, this feature is built as an extension of the regular posts list homepage and as such it is in fact the blog (home)page, which is similar to a category section.
To control what external services see as main attributes (title, descriptions, tags, text, images) on the homepage, use a SEO plugin that provides this functionality (for example Yoast).