Enable Genesis author box on single posts. Sources: http://my.studiopress.com/snippets/author-box/#enable-single and https://sridharkatakam.com/enable-author-box-single-entries-post-type-genesis/

enable-genesis-author-box-on-posts-type-only.php

<?php

//* Enable Genesis author box on single entries of 'post' type only
//* https://sridharkatakam.com/enable-author-box-single-entries-post-type-genesis/
add_filter( 'get_the_author_genesis_author_box_single', 'sk_author_box_single' );
function sk_author_box_single() {

	if ( is_singular( 'post' ) ) {
		return true;
	}

}

enable-genesis-author-box-on-single-posts.php

<?php

//* Enable Genesis author box on single posts
add_filter('get_the_author_genesis_author_box_single', '__return_true');