Customization of Breadcrumbs

Hello,

Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for the delay.

You can use and customize our filter to customize your breadcrumbs:
https://rankmath.com/kb/filters-hooks-api-developer/#change-remove-breadcrumb-items

Here is an example of customizing the breadcrumbs on how to add a crumb to the trail using the array_splice() function:

/**
 * Allow changing or removing the Breadcrumb items
 *
 * @param array       $crumbs The crumbs array.
 * @param Breadcrumbs $this   Current breadcrumb object.
 */
add_filter( 'rank_math/frontend/breadcrumb/items', function( $crumbs, $class ) {
        //Adding to single posts
	if(is_singular('post')){
                //pass an array containing the name of the crumb, URL and 
                //hide_in_schema option	
                $value[] = array(
		'Custom Page', 
                'http://localhost/rankmath', 
                'hide_in_schema' => false
		);
                //add this value as the second item in array
		array_splice( $crumbs, 1, 0, $value ); 
		return $crumbs; 
	}
	return $crumbs;
}, 10, 2);

I hope that helps. Thank you, and please don’t hesitate to contact us if you need further assistance.