Removing products from a particular category on the shop page.

functions.php

<?php

function hpcs_hide_products_category_shop( $query ) {
  
    $tax_query = (array) $query->get( 'tax_query' );
  
    $tax_query[] = array(
           'taxonomy' => 'product_cat',
           'field' => 'slug',
           'terms' => array( 'chairs' ), // Category slug here
           'operator' => 'NOT IN'
    );
  
  
    $query->set( 'tax_query', $tax_query );
  
}
add_action( 'woocommerce_product_query', 'hpcs_hide_products_category_shop' );