Limit number of items on RSS in Feeds (drawing from Substack)

It may be a dumb question, but I'm trying to set up a basic feed (in Feeds) from Substack for a site I'm building in Foundation 6 (so our whole team can give updates on the go - not unlike a Twitter or Threads feed, but so that we can go into more detail).

I'm wondering if there is a simple way to limit the number of items that will show on the page. At the moment, too many items will break the mobile layout as the feed keeps showing underneath the footer as the items continue below. I saw one suggestion here for limiting word count, but that's not really what I'm looking for and it involved twigs, which I'd never heard of (and researching it is making my head hurt).

Man, I used to be good at Rapidweaver, but took a few years off and I have some serious catching up to do! Love Foundation and these new stacks but this is a heck of a learning curve...

Thanks.

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