Storefront theme: No Post Summaries?

I’m running the Storefront theme, but I also have a blog along with my shop. I’d really like it if my /blog page, the the main post page, showed only summaries/previews of each post on the page. Instead, what I get is a /blog page 4 miles long because every post is shown in full (and I have it set to show a whole bunch on one page). It’s overwhelming to navigate, even though I have widgets for easier navigation.

Is there any way to get my /blog page/posts page to display only summaries rather than full posts? That way you’d just click the summarized post’s title to link to the full post if you wanted to read it. Thanks!