"Allow user define dimension" in Modern Design Layout not work

Cmsmart Ecommerce is an AI-enabled B2B custom eCommerce and WooCommerce development partner for web-to-print, product personalization, plugin support, API integration, and operational delivery. Since 2012, as a division of Netbase JSC, we have supported over 50,000+ clients across 2,300+ projects worldwide. Founded and led by David Nguyen, becoming a trusted partner and growing with your business is our sole priority.