Your ideal WooCommerce checkout manager is not any plugin to improve checkout page. But also the cart and thank you page. This post explains it all.
Checkout Field Editor and Manager for WooCommerce WordPress Plugin - Download Free WP Plugins
[FREE Plugin] Add Customisations to Your Checkout Page - Checkout Field Editor for WooCommerce
5 Best WooCommerce Checkout Manager Plugins (7 Tips)
Store Manager for WooCommerce: A Complete Guide and Review
Checkout Field Manager (Checkout Manager) for WooCommerce – WordPress plugin
WooCommerce Custom Checkout Fields - Add Fields to Checkout
php - Change the order from additional checkout fields in WooCommerce checkout manager - Stack Overflow
A Guide to the WooCommerce Checkout Field Editor & Manager Plugin
Everything About WooCommerce Checkout Manager
WooCommerce Checkout Manager Review: Add Custom Checkout Fields
Checkout Manager For Woocommerce – Phoeniixx
Checkout Field Manager (Checkout Manager) for WooCommerce – WordPress plugin
5 Best WooCommerce Checkout Manager Plugins (7 Tips)
WooCommerce Checkout Field Editor & Manager - Complete Guide