There's a lot of tools in DevTools already, probably more than you use. But in some cases, you may need very specific tools that aren't available by default.
Thankfully, DevTools can be extended with custom tools! You can either download extensions others have created to customize the DevTools UI, or even create your own.
For example, you can download the React DevTools extension for Chrome, Firefox, or Edge.
To go further, you can create your own extensions. Here are a few links to learn about developing your own extensions: