How to Hide The School Management - Education & Learning Management Admin Menus

function plt_hide_school_management_system_menus() {
	//Hide "School Management".
	remove_menu_page('school-management-system');
	//Hide "School Management → Dashboard".
	remove_submenu_page('school-management-system', 'school-management-system');
	//Hide "School Management → Classes".
	remove_submenu_page('school-management-system', 'sm-classes');
	//Hide "School Management → Sessions".
	remove_submenu_page('school-management-system', 'sm-sessions');
	//Hide "School Management → Settings".
	remove_submenu_page('school-management-system', 'sm-settings');

	//Hide "SM School".
	remove_menu_page('sm-staff-dashboard');
	//Hide "SM School → Dashboard".
	remove_submenu_page('sm-staff-dashboard', 'sm-staff-dashboard');
	//Hide "SM School → Inquiries".
	remove_submenu_page('sm-staff-dashboard', 'sm-staff-inquiries');
	//Hide "SM School → Settings".
	remove_submenu_page('sm-staff-dashboard', 'sm-staff-settings');

	//Hide "SM Academic".
	remove_menu_page('sm-staff-academic');
	//Hide "SM Academic → Dashboard".
	remove_submenu_page('sm-staff-academic', 'sm-staff-academic');
	//Hide "SM Academic → Class Sections".
	remove_submenu_page('sm-staff-academic', 'sm-staff-classes');
	//Hide "SM Academic → Subjects".
	remove_submenu_page('sm-staff-academic', 'sm-staff-subjects');
	//Hide "SM Academic → Noticeboard".
	remove_submenu_page('sm-staff-academic', 'sm-staff-notices');

	//Hide "SM Student".
	remove_menu_page('sm-staff-student');
	//Hide "SM Student → Dashboard".
	remove_submenu_page('sm-staff-student', 'sm-staff-student');
	//Hide "SM Student → Admission".
	remove_submenu_page('sm-staff-student', 'sm-staff-admissions');
	//Hide "SM Student → Students".
	remove_submenu_page('sm-staff-student', 'sm-staff-students');
	//Hide "SM Student → ID Cards".
	remove_submenu_page('sm-staff-student', 'sm-staff-id-cards');
	//Hide "SM Student → Promote".
	remove_submenu_page('sm-staff-student', 'sm-staff-promote');

	//Hide "SM Administrator".
	remove_menu_page('sm-staff-administrator');
	//Hide "SM Administrator → Dashboard".
	remove_submenu_page('sm-staff-administrator', 'sm-staff-administrator');
	//Hide "SM Administrator → Roles".
	remove_submenu_page('sm-staff-administrator', 'sm-staff-roles');
	//Hide "SM Administrator → Staff".
	remove_submenu_page('sm-staff-administrator', 'sm-staff-employees');

	//Hide "SM Accounting".
	remove_menu_page('sm-staff-accounting');
	//Hide "SM Accounting → Dashboard".
	remove_submenu_page('sm-staff-accounting', 'sm-staff-accounting');
	//Hide "SM Accounting → Fee Invoices".
	remove_submenu_page('sm-staff-accounting', 'sm-staff-invoices');
}

add_action('admin_menu', 'plt_hide_school_management_system_menus', 11);

Where do I put this code?