function plt_hide_webp_express_menus() {
//Hide the "Media → WebP Express" menu.
remove_submenu_page('upload.php', 'webp_express_conversion_page');
//Hide the "Settings → WebP Express" menu.
remove_submenu_page('options-general.php', 'webp_express_settings_page');
}
add_action('admin_menu', 'plt_hide_webp_express_menus', 11);