function plt_hide_emailoctopus_menus() {
//Hide the "EmailOctopus" menu.
remove_menu_page('emailoctopus-forms');
//Hide the "EmailOctopus → Forms" menu.
remove_submenu_page('emailoctopus-forms', 'emailoctopus-forms');
//Hide the "EmailOctopus → Settings" menu.
remove_submenu_page('emailoctopus-forms', 'emailoctopus-settings');
}
add_action('admin_menu', 'plt_hide_emailoctopus_menus', 11);