On Advanced Custom Fields Free there doesn’t seem to be an out of the box way to do so. There’s a plugin which claims to do so for ACF 5 ( pro ):
https://wordpress.org/plugins/acf-get-nav-menus/
But whenever installed using ACF 4 ( free ) it doesn’t seem to work and may break on install. The description says it only support ACF 5+ ( which I haven’t tested on ).
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That being said you could achieve this using the hooks that ACF provides developers to work with, is this an option? You would need to add the code into a function.php file or as a separate plugin.
