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Increase Custom Fields Dropdown Limit

For your functions.php file or custom plugin:

// Increase number of meta fields shown in dropdown
add_filter('postmeta_form_limit', 'customfield_limit_increase');
function customfield_limit_increase($limit) {
  $limit = 100;
  return $limit;
}

Otherwise, the dropdown for Custom Fields is capped at 30 (alphabetically).

Before:

After:

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