To see only followed people's posts, without seeing subscribed communities' posts, I don't think there's a way.

However, since microblog posts on communities are still rare, one thing you can do is to browse the subscribed microblog feed, https://thebrainbin.org/sub/microblog, as then mostly the people you follow should appear on, and rarely posts to communities.

Also if that's what you seek, you can go to the general settings, https://thebrainbin.org/settings/general, and set "Homepage" as "Subscriptions", and "Front page default view" as "Microblog".