Blog
The Blog extension relabels WordPress's default Posts as Blog throughout the admin and the front end. On a site where "Posts" really means the blog, this makes the dashboard read the way content editors expect: Blog → Add blog post, All blog posts, Search blog posts, and so on (the post type's labels and its category/tag taxonomy labels are all updated).
It's a labeling and UX convenience, it doesn't change how posts work or where they're stored, so it's completely safe to turn on or off.
Activate
Enable Blog from Unyson+ → Extensions. The Posts admin menu becomes Blog Post immediately, no other configuration.
This extension only changes the labels. How your blog looks (list / grid / masonry layout, columns, featured images, excerpts, meta, the single-post layout, archives and search) is configured in Theme Settings → Blog in the Unyson+ Theme. See The Theme.