Hide WooCommerce Category and its sub-categories from Shop page

functions.php

<?php

/**
 * Show products only of selected category.
 */
function get_subcategory_terms( $terms, $taxonomies, $args ) {
 
	$new_terms 	= array();
	$hide_category 	= array( 126 ); // Ids of the category you don't want to display on the shop page
  
  // Getting ids of sub-categories start
  $child_args = array(
      'taxonomy' => 'product_cat',
      'hide_empty' => false,
      'parent'   => 126
  );
  $child_product_cats = get_terms( $child_args );
  
  foreach( $child_product_cats as $sub_category ) {
       array_push( $hide_category, $sub_category->term_id );
  }
  // Getting id of sub-categories ends
 	
 	// if a product category and on the shop page
	if ( in_array( 'product_cat', $taxonomies ) && !is_admin() && is_shop() ) {

	    foreach ( $terms as $key => $term ) {

		if ( ! in_array( $term->term_id, $hide_category ) ) { 
			$new_terms[] = $term;
		}
	    }
	    $terms = $new_terms;
	}
  return $terms;
}
add_filter( 'get_terms', 'get_subcategory_terms', 10, 3 );