Hide the ACF admin menu dynamically based on site domain

control-acf-menu-visibility.php

<?php
add_filter( 'acf/settings/show_admin', function () {

	// Get the current site url.
	$site_url = get_bloginfo( 'url' );

	// Define an array of protected site urls.  
	$protected_urls = array(
		'https://www.example.com',
		'http://staging.example.com'
	);

	// If the current site URL is in the array of protected URLs, return FALSE
	// to hide the menu.
	return ! in_array( $site_url, $protected_urls );
} );