az_bef_extend.module

<?php

use Drupal\Core\Form\FormStateInterface;
use Drupal\views\ViewExecutable;


function az_bef_extend_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  // Attach your custom library
  $form['#attached']['library'][] = 'az_bef_extend/az_bef_extend';
  $view_id = '';
  $display_id = '';
  $vert = 0;
  $reset = 0;
  $config = NULL;

  // Check if the form is a Views exposed form
  if ($form_id === 'views_exposed_form') {
    /** @var ViewExecutable $view */
    $view = $form_state->get('view') ?: $form['#view'];
    if ($view) {
      if($view->id() !== 'watchdog'){
        $view_id = $view->id();
        $display_id = $view->getDisplay()->display['id'];

        $form_state->set('view_id', $view_id);
        $form_state->set('display_id', $display_id);

        // Load the specific configuration for this view and display
        $config = \Drupal::config('az_bef_extend.settings.' . $view_id . '.' . $display_id);
        $vert = $form_state->getValue('az_bef_extend_vertical');
        $reset = $form_state->getValue('az_bef_extend_move_reset');

        // Apply settings to the form
        if ($config->get('move_reset_to_top')) {
          $form['#attributes']['class'][] = 'top-reset';
        }
        if ($config->get('vertical_style')) {
          $form['#attributes']['class'][] = 'bef-vertical-style';
        }
      }
    }
  }
  // Check if the form is the Views UI edit display form
  if ($form_id == 'views_ui_edit_display_form') {
    $view = $form_state->get('view') ?: $form['#view'];
    if($view){
      $view_id = $view->id();

      // The display ID is usually part of the form state or URL
      $display_id = $form_state->get('display_id') ?: 'default';

      // Load the specific configuration for this view and display
      $config = \Drupal::config('az_bef_extend.settings.' . $view_id . '.' . $display_id);
      $vert = $config->get('vertical_style');
      $reset = $config->get('move_reset_to_top');
    }
    // Check if BEF is used in this view
    $is_bef = false;
    if (isset($form['options']) && is_array($form['options'])) {
      foreach ($form['options']['exposed_form_options'] as $key => $value) {
          if (strpos($key, 'bef') !== false) {
            $is_bef = true;
            break;
          }
      }
    }

    if ($is_bef) {
      // Add custom settings to the form
      $form['options']['az_bef_extend_vertical'] = [
        '#type' => 'checkbox',
        '#title' => t('Use vertical filter styling'),
        '#default_value' => $vert,
        '#description' => t('When checked, this will apply vertical styling to the filters.'),
        '#weight' => -50,
      ];

      $form['options']['az_bef_extend_move_reset'] = [
        '#type' => 'checkbox',
        '#title' => t('Move reset button to top'),
        '#default_value' => $reset,
        '#description' => t('When checked, and if the reset button is enabled, move it to the top of the filters.'),
        '#weight' => -49,
      ];

      // Add a custom submit handler to save these settings
      $form['actions']['submit']['#submit'][] = 'az_bef_extend_bef_settings_submit';
    }
  }

}

/**
 * Custom submit handler for the BEF settings.
 */
function az_bef_extend_bef_settings_submit($form, FormStateInterface $form_state) {
  $view = $form_state->get('view') ?: $form['#view'];
  $view_id = $view->id();
  $display_id = $form_state->get('display_id');

  // Retrieve the values from the form
  $vertical_style = $form_state->getValue('az_bef_extend_vertical');
  $move_reset_to_top = $form_state->getValue('az_bef_extend_move_reset');

  // Save the settings specific to this view and display
  \Drupal::configFactory()->getEditable('az_bef_extend.settings.' . $view_id . '.' . $display_id)
            ->set('vertical_style', $vertical_style)
            ->set('move_reset_to_top', $move_reset_to_top)
            ->save();
}