acf/options_page/save

Description
Fires after publishing a save on an options page.
This action allows you to hook in after an options page has been saved in the admin.
Parameters
do_action( 'acf/options_page/save', $post_id, $menu_slug );
$post_id (int|string) The ID of the page being edited.
$menu_slug (string) The current options page menu slug.
The 
$post_id defaults to ‘options’, but can be set as a post or a user ID when registering the options page.
Changelog
Added in version 6.1.7
Example
add_action('acf/options_page/save', 'my_acf_save_options_page', 10, 2);
function my_acf_save_options_page( $post_id, $menu_slug ) {
    if ( 'theme-settings' !== $menu_slug ) {
        return;     
    }
    // Get newly saved values for the theme settings page.
    $values = get_fields( $post_id );
    // Check the new value of a specific field.
    $analytics_code = get_field('analytics_code', $post_id);
    if( $analytics_code ) {
        // Do something...
    }
}