Components
If you want to hide a field inside the Inline Entity Form you have to use the hook_inline_entity_form_entity_form_alter() hook – standard form alter hook won’t work. For example, to hide the status field you can do something like this:
/**
* Implements hook_inline_entity_form_entity_form_alter().
*/
function MY_MODULE_inline_entity_form_entity_form_alter(&$entity_form, &$form_state) {
if (in_array($entity_form['#entity_type'], ['YOUR_ENTITY_TYPE_1', 'YOUR_ENTITY_TYPE_2'])) {
$entity_form['status']['#access'] = FALSE;
}
}