By doing this you're breaking the "guarantees" that CRA provides. That is to say you now "own" the configs. No support will be provided. Proceed with caution.
"Stuff can break" — Dan Abramov https://twitter.com/dan_abramov/status/1045809734069170176
For simple pages, I just create a new webpack config using Webpack config tool, which lets configure webpack online.
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If you need to override some settings, you can use React-App-Rewired.
You don't have full control and it's not recommended.
For simple pages, I just create a new webpack config using Webpack config tool, which lets configure webpack online.