Adding Yoast breadcrumbs to the single post in Hestia / Hestia Pro. This should either be done in a child theme, or in a plugin.

hestia-yoast-breadcrumbs.php

<?php

/**
 * Add Yoast breadcrumbs to Hestia Single Post.
 *
 * There are two ways to do this:
 *
 * 1. Create a child theme and add this snippet to your functions.php file.
 * Check out the docs: https://docs.themeisle.com/article/656-how-to-create-a-child-theme-for-hestia
 * 
 * 2. Create a folder called mu-plugins under your wp-content folder. Create a file called enhancements.php 
 * and paste the contents here inside it. 
 *
 */
function hestia_child_theme_yoast_breadcrumbs() {
	if ( ! function_exists('yoast_breadcrumb') ) {
		return;
	}
	yoast_breadcrumb( '<small id="breadcrumbs" style="margin-bottom: 20px; display: block;">','</small>' );
}

add_action( 'hestia_before_single_post_article', 'hestia_child_theme_yoast_breadcrumbs', 0 );