[Theme: Nucleare] There is no "read more" but only the full post

Goodday,

I use the theme Nucleare and I thinks it is wonderful, but I have one question. In the demo I see that all of the posts show a little of the post, followed by a read-more button. On my blog I only see the full posts and I like the version with the read more button.

In the settings I have found the option where you can select the full post or a summary. But by both options the full post is visible at my home page.

What do I have to do to see the shorter version on my home page with the “read more” butten instead of the full post?