How to Hide Swift Help Desk Support Software Ticketing System Admin Menus

function plt_hide_help_desk_support_software_menus() {
	//Hide "Swift Helpdesk".
	remove_menu_page('shd_settings');
	//Hide "Swift Helpdesk → Settings".
	remove_submenu_page('shd_settings', 'shd_settings');
	//Hide "Swift Helpdesk → Feedback".
	remove_submenu_page('shd_settings', 'shd_feedback');
	//Hide "Swift Helpdesk → Use / Help".
	remove_submenu_page('shd_settings', 'shd_use_help');
	//Hide "Swift Helpdesk → Updates & Tips".
	remove_submenu_page('shd_settings', 'shd_dashboard');
}

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

Where do I put this code?