Remove one of the two "Apply to selected items" submit buttons with Node Bulk Operations
This is intentional functionality for some workflows (for long lists of results).
If you wanted to get rid of the button, you could hook_form_alter it away. Form IDs and array structure are dynamic based on your view so you'll have to adjust accordingly based on the view &amp; action button to remove (this can be found in the Views UI, if not known).
/**
 * Implements hook_form_alter().
 */
function MODULE_form_alter(&amp;$form, FormStateInterface $form_state, $form_id) {

  // @TODO: Determine view_id / display_id / field_id for a specific VBO form:
  if ($form_id == 'views_form_' . $view_id . '_' . $display_id) {
    // HEADER ACTION BUTTON:
    //unset($form['header'][$field_id]['actions']);
    // FOOTER ACTION BUTTON:
    //unset($form['actions']['submit']);
  }