please try adding this given code in your wplms-customizer.php file in wplms customizer plugin :
add_filter('wplms_course_creation_tabs',function($tabs, $course_id=null, $user_id=null){
/* check if user can manage options or not */
$curriculum_elements = $tabs['course_curriculum']['fields'][0]['curriculum_elements'];
foreach ($curriculum_elements as $key => $curriculum_element) {
/*hide unit tag */
if($curriculum_element['type'] == 'unit'){
foreach ($curriculum_element['types'] as $key1 => $unit_type) {
$ffs = [];
foreach ($curriculum_element['types'][$key1]['fields'] as $key2 => $field) {
if($field['id']!='vibe_duration'){
$ffs[]=$field;
}
}
$curriculum_element['types'][$key1]['fields'] = $ffs;
}
}
$curriculum_elements[$key] = $curriculum_element;
}
$tabs['course_curriculum']['fields'][0]['curriculum_elements'] = $curriculum_elements;
return $tabs;
},10,3);