Posts Page Settings
The Posts Page section in the customiser applies to your blog page, categories, archive and search results.
The options available let you set the number of columns on various devices, show the author, date, category and excerpt. You can also show the previous and next post titles on single posts.
The categories option needs a bit of explaining. To get the category ID go to Posts > Categories in your dashboard. You then list the ones you want including. To exclude a category put a minus sign in front of the IS.