I'm having the same issue, blogs used to stack up with the full blog and images and now no images, just an excerpt and a 'Read More' link. None of these suggestions work. This is new. Using Forte template. Past blog posts show up fully, no 'Read More' link.
There is no toggle for images in Blog in Site Styles. Is this a premium feature? It also doesn't call it 'Blog List', just 'Blog' and it lists the only options as Show Author Name, Sidebar Position & Width.
Making post Featured doesn't affect it.
Adding an thumbnail image did not make the blog and images show.
SOLUTION FOUND: After fiddling around with it for about an hour and trying all kinds of variations, I just discovered that by placing specific text in the Exceprt section of Options under Edit Post is what appears to be making the blog show just the excerpt. By removing all text in that section, my blog posts not show up on my main page in full, with images.