To remove “Category:” from category title on WordPress Just follow below steps:

1. Open functions.php file in your wordpress theme
2. Add below code at the end of the file

   function prefix_category_title( $title ) {
   if ( is_category() ) {
   $title = single_cat_title( '', false );
   }
   return $title;
   }
   add_filter( 'get_the_archive_title', 'prefix_category_title' );
   

    

3. Save the file
4. Open your Category page now