Apparently this is a feature of Anatole: * Post Thumbnails (optional)
How do I get them to display? I’ve installed the theme on https://wowwaikawa.micro.blog which only has 1 post so far. What I thought I’d be able to see is that on the Home page there would be a post with some text and one of the photos from the post.
I don’t see any option to enable the post thumbnails. Have I misunderstood things?
it requires setting custom front matter to a field called thumbnail, which is not a thing that micro.blog allows.
Ah, thanks Jason. That solves that then!
If you’re up for some custom theming, we could just fetch the post’s first image and display that as a thumbnail.
In the template layouts/index.html you should find a handful of lines looking like this:
{{ if .Params.thumbnail }}
<div class="post__thumbnail-wrapper">
<a href="{{ .RelPermalink }}">
<img class="post__thumbnail" src="{{ .Params.thumbnail | relURL }}" alt="Thumbnail image" loading="lazy" />
</a>
</div>
{{ end }}
Replace those lines with the ones below:
{{ if .Params.photos_with_metadata }}
{{ $thumbnail := index .Params.photos_with_metadata 0 }}
<div class="post__thumbnail-wrapper">
<a href="{{ .RelPermalink }}">
<img class="post__thumbnail" src="{{ $thumbnail.url }}" width="{{ $thumbnail.width }}" height="{{ $thumbnail.height }}" alt="" loading="lazy" />
</a>
</div>
{{ end }}
And you should be good to go. 
By default, the theme crops thumbnails. If you don’t like that behavior, add the following custom CSS:
.post__thumbnail {
height: auto;
}
