Related Products Manager for WooCommerce plugin lets you customize related products in WooCommerce.
You change displayed WooCommerce related products number, columns, order; relate by tag, category, product attribute or manually on per product basis. Hide related products completely. Change related products title and/or position.
You may need to clear all products transients to immediately see results on frontend after changing plugin’s settings. Alternatively you can just update each product individually to clear its transients.