Why aren't my posts showing up as summaries?

My blog is here: https://www.scriptherapy.net and I am using the Lugada theme. I want my home page to be populated with the first paragraph or so of all of my most recent posts. ALSO, I want the same summaries to be displayed – instead of the ENTIRE post – when someone does a search (for example, here is a search on my blog for the word “help”: https://www.scriptherapy.net/?s=help).

I’ve tried going to Settings > Reading >
Front page displays : Your latest posts
For each article in a feed, show : Summary

But still, the display doesn’t change. So I’m thinking it must be something specified within the theme. But I don’t know where to look.