Got it. In functions.php
// Add support for featured content.
add_theme_support( 'featured-content', array(
'featured_content_filter' => 'twentyfourteen_get_featured_posts',
'max_posts' => 6,
) );
Now, how do I set max_posts in child?
I tried, but with no dice. I’ll eventually check it sometime, but I’m not sure if it would work as a child theme setting. Does the /inc/ files works with child?
After messing in a bunch of references to 6 posts and max_posts, I went to customize and it worked. Not sure which file made the magic, but it only worked after going to customize.