Hide term from media library

Hi Nadia,
Sorry, I should have given more information.

I have a media category called ‘avatar’, with an ID of 177. I wanted to hide these from appearing in the media library (upload.php).

I managed to do it by adding this code to functions.php

function hide_media_categories($query) {
	global $pagenow;

   if( ( 'upload.php' != $pagenow   ) || !$query->is_admin ){
		return $query;
	}

   $tax_query = array(
      array(
        'taxonomy' => 'media_category',
        'field' => 'id',
        'terms' => array(177),
        'operator' => 'NOT IN'
      )
   );

   $query->set( 'tax_query', $tax_query );
}
add_filter('pre_get_posts', 'hide_media_categories');