Hides TSF's admin interface from everyone but the Super Administrator (capability manage_network, or manage_options on non-multisite).

hide-tsf-from-all-but-super-admin.php

<?php
/**
 * Plugin Name: TSF Headless Mode for non-super-admin.
 * Plugin URI: https://theseoframework.com/
 * Description: Enables Headless Mode for The SEO Framework in the admin area for non-admins.
 * Version: 1.0.0
 * Author: Sybre Waaijer
 * Author URI: https://theseoframework.com/
 * License: GPLv3
 */

add_action(
	'plugins_loaded',
	function() {
		// If on the admin area, and if the user isn't a super admin, hide all SEO settings and prevent overwriting settings:
		if ( is_admin() && ! is_super_admin() )
			define( 'THE_SEO_FRAMEWORK_HEADLESS', true );
	},
	4
);