/**
 * Hide specific WooCommerce products from the main Shop page.
 *
 * The products will still be accessible through:
 * - Their direct product URLs
 * - Product category pages
 * - Custom product sections
 */
function inmate_create_hide_specific_shop_products( $query ) {

	// Do not run in the WordPress admin dashboard.
	if ( is_admin() ) {
		return;
	}

	// Only affect the main WooCommerce Shop page.
	if ( ! is_shop() ) {
		return;
	}

	/*
	 * Enter the IDs of the products you want to hide.
	 * Separate each ID with a comma.
	 */
	$hidden_product_ids = array(
		22675,
	);

	// Preserve any products already excluded by WooCommerce or another plugin.
	$existing_excluded_ids = (array) $query->get( 'post__not_in' );

	// Add the selected product IDs to the exclusion list.
	$query->set(
		'post__not_in',
		array_unique(
			array_merge(
				$existing_excluded_ids,
				array_map( 'absint', $hidden_product_ids )
			)
		)
	);
}

add_action(
	'woocommerce_product_query',
	'inmate_create_hide_specific_shop_products'
);<?xml version="1.0" encoding="UTF-8"?>
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