For some reason, this HAS to be added to functions.php; MU plugin does not work. Although I don’t use it, ACF has added the ability to create option pages in its UI; another example of scope-creep in an effort to charge more, no doubt.
if( function_exists('acf_add_options_page') ) {
acf_add_options_page(array(
'page_title' => 'Site Options',
'menu_title' => 'Options',
'menu_slug' => 'site-options',
'capability' => 'edit_posts',
'redirect' => false
));
acf_add_options_sub_page(array(
'page_title' => 'Header Options',
'menu_title' => 'Header',
'parent_slug' => 'site-options',
));
acf_add_options_sub_page(array(
'page_title' => 'Footer Options',
'menu_title' => 'Footer',
'parent_slug' => 'site-options',
));
}






