Cart Edit screen should allow just to edit and update single parameter ( ex: qty) also for configurable product. · Issue #900 · magento/pwa-studio · GitHub
User Guide - Magento 2 Simple Details on Configurable Products
Magento 2 101: How To Create A Configurable Product | Human Element
Edit in Cart Magento 2 Extension | MexBS - Professional Magento 2 Extensions