Recommended posts section is disabled for Clear and Bold style of a single blog post.
But you can activate them commenting out a line in your child theme. So, in order to do that:
Directory structure should be the same as in the parent theme.
if ( mk_get_blog_single_style() !== 'bold' ) {
mk_get_view( 'blog/components', 'blog-similar-posts' );
}
to:
//if ( mk_get_blog_single_style() !== 'bold' ) {
mk_get_view( 'blog/components', 'blog-similar-posts' );
//}
This will show the related posts in Clear & Bold style.