function plt_hide_imagify_menus() {
//Hide "Tools → Scheduled Actions".
remove_submenu_page('tools.php', 'action-scheduler');
//Hide "Settings → Imagify".
remove_submenu_page('options-general.php', 'imagify');
//Hide "Media → Bulk Optimization".
remove_submenu_page('upload.php', 'imagify-bulk-optimization');
//Hide "Media → Other Media".
remove_submenu_page('upload.php', 'imagify-files');
}
add_action('admin_menu', 'plt_hide_imagify_menus', 11);