Exclude Specific Product Categories from WooCommerce Shop Page

exclude_product_cats_woocommerce.php

// Exclude products from a particular category on the shop page

function ocs_custom_pre_get_posts_query( $q ) {
	if( is_shop() || is_page('shop') ) {
	    $tax_query = (array) $q->get( 'tax_query' );

	    $tax_query[] = array(
        'taxonomy' => 'product_cat',
        'field'    => 'slug',
        'terms'    => array( 'cat-1', 'cat-2', 'cat-3' ),
        'operator' => 'NOT IN'
	    );

	    $q->set( 'tax_query', $tax_query );
	}
}
add_action( 'woocommerce_product_query', 'ocs_custom_pre_get_posts_query' );