Thanks for the snippet.
I made two changes. One was to add the ‘function’, and the second was to change it so that no Admin fields are required vs making all Front End fields required.
add_filter('acf/prepare_field', 'not_required_in_admin');
function not_required_in_admin($field) {
if (is_admin()) {
$field['required'] = false;
}
return $field;
}