WP Custom Fields Metabox Disappears – ACF plugin issue [closed]

ACF 5.6+ intentionally removes the custom fields metabox to improve performance when loading posts. To display the metabox, add this to functions.php in your theme:

add_filter( 'acf/settings/remove_wp_meta_box', '__return_false' );

In addition to the above code, make sure that the custom fields metabox is enabled in Screen Options at the top of a post, and that an individual ACF field group is not disabling the custom fields functionality in its settings.

https://www.advancedcustomfields.com/resources/known-issues/#acf-5.6.0

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