Please add the given code in your wplms-customizer.php file in wplms customizer plugin :
add_action('init','wplms_modern_related_course_remove'); function wplms_modern_related_course_remove(){ $modern = Wplms_Modern_Init::init(); remove_action('wplms_modern_after_course_front',array($modern,'wplms_modern_course_front')); }