Node listings on taxonomy term page How to disable/remove node listings on taxonomy term page in Drupal 8?
function THEME_NAME_theme_suggestions_page_alter(&$suggestions, &$vars) {
            if (\Drupal::routeMatch()->getRouteName() == 'entity.taxonomy_term.canonical' && $tid = \Drupal::routeMatch()->getRawParameter('taxonomy_term')) {
              $term = Drupal\taxonomy\Entity\Term::load($tid);
              $suggestions[] = 'page__taxonomy__' . $term->getVocabularyId();
            }
          }


Create template file "page--taxonomy--VOCABULARYNAME.html.twig" in template folder and you can customize the page with the help of template file.