Overrides \Drupal\block\BlockBase::form().
Overrides BlockBase::form
public function form($form, &$form_state) {
$form = parent::form($form, $form_state);
// Set the default label to '' so the views internal title is used.
$form['label']['#default_value'] = '';
$form['label']['#access'] = FALSE;
return $form;
}