WordPress | Remove post from main blog loop if it has a certain Tag

wordpress-exclude-posts-from-main-blog-if-has-certain-tag.php

<?php
/**
 *	https://codex.wordpress.org/Class_Reference/WP_Query#Tag_Parameters
 *  On the page that is set to be the blog homepage (Posts Page), exclude a post from the loop, if it has a certain tag ID
**/

// exclude posts from the main blog loop, if it has the Focus tag
function fs_exclude_specific_tag( $query ) {
	if ( !is_admin() && $query->is_home() && $query->is_main_query() ) {
		// $query->set( 'tag', '-141' );
		$query->set( 'tag__not_in', array('141') );
	}
}
add_action( 'pre_get_posts', 'fs_exclude_specific_tag' );