Added twig suggestion is not used I have added twig suggestion from .theme file to views__view.html.twig for customizing taxonomy.

   function mediumish_blog_theme_suggestions_views_view_alter(array &amp;$suggestions, array $variables) {
      if (\Drupal::routeMatch()-&gt;getRouteName() == 'entity.taxonomy_term.canonical' &amp;&amp; $tid = \Drupal::routeMatch()-&gt;getRawParameter('taxonomy_term')) {
       $term = Term::load($tid);
       $suggestions[] = 'views__view__taxonomy_term';
     }
   }


I am getting suggestion in twig suggestion display but when i am creating file and applying my custom theme, its not actually displaying output of that file, Its still using the default views--view.html.twig.
Replace the underscore characters with hyphens, and clear the cache.

The template filename should be views--view--taxonomy--term.html.twig.

   function mediumish_blog_theme_suggestions_views_view_alter(array &amp;$suggestions, array $variables) {
      if (\Drupal::routeMatch()-&gt;getRouteName() == 'entity.taxonomy_term.canonical' &amp;&amp; $tid = \Drupal::routeMatch()-&gt;getRawParameter('taxonomy_term')) {
       $term = Term::load($tid);
       $suggestions[] = 'views__view__taxonomy__term';
     }
   }