Disable Gutenberg Editor (enable Classic Editor)Disable the Gutenberg editor programmatically and enable the Classic editor PHP Admin Gutenberg
Disable WordPress Password Strength MeterSimplify registration; disable password strength PHP Admin Login Security
Disable Widget Blocks (enable Classic Widgets)Use Classic Widgets instead of Block Widgets PHP Admin Widgets
Custom Admin Column WooCommerce OrdersAdd a custom column to the WooCommerce Orders admin page PHP Admin WooCommerce
Change the WordPress Post Type LabelsModify post type labels for your site PHP Admin Custom Post Types