In ACF version 5.5.13, they added a setting to remove the default WordPress custom field metabox to speed up the load times on the post edit page. The idea being that you shouldn’t need the default metabox since you’re using ACF.
However if you need to have the default WordPress custom field metabox enabled, then you need to add the following code to your WordPress theme’s functions.php file.
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add_filter(‘acf/settings/remove_wp_meta_box’, ‘__return_false’);
This will solve the custom fields option missing issue in WordPress.
