Drupal 8 hide meta tag fields in node form
I'll make the assumption you're using the Metatag module (https://www.drupal.org/project/metatag).

Unfortunately, this module doesn't allow fine-grain control of fields through its UI, so the only way I've found to hide these fields is through a form alter.

In this case, I'm modifying all node forms (use whatever hook fits your scenario here). Example, hiding the "advanced" fieldset entirely by disabling access to it, so it's not rendered:

function MY_MODULE_form_node_form_alter(&amp;$form, \Drupal\Core\Form\FormStateInterface $form_state, $form_id) {
    $form['field_metadata']['widget']['0']['advanced']['#access'] = FALSE;
}


I'm sure this can be modified to target more specific nested groups/fields, but should give you a start at least!