How to Hide HelpGent Admin Menus

function plt_hide_helpgent_menus() {
	//Hide "HelpGent".
	remove_menu_page('helpgent-menu');
	//Hide "HelpGent → All Forms".
	remove_submenu_page('helpgent-menu', 'helpgent');
	//Hide "HelpGent → Tags".
	remove_submenu_page('helpgent-menu', 'http://127.0.0.1/wp-admin/admin.php?page=helpgent#/tags');
	//Hide "HelpGent → Contacts".
	remove_submenu_page('helpgent-menu', 'http://127.0.0.1/wp-admin/admin.php?page=helpgent#/contacts');
	//Hide "HelpGent → Settings".
	remove_submenu_page('helpgent-menu', 'http://127.0.0.1/wp-admin/admin.php?page=helpgent#/settings');
	//Hide "HelpGent → Media Migration".
	remove_submenu_page('helpgent-menu', 'http://127.0.0.1/wp-admin/admin.php?page=helpgent#/media-migration');
	//Hide "HelpGent → Go Pro".
	remove_submenu_page('helpgent-menu', 'https://wpwax.com/helpgent');
}

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

Where do I put this code?