Resaltar el enlace de NAV actual en React
import { NavLink } from 'react-router-dom';
<NavLink to='about' activeClassName="active">about</NavLink>
// Or specifing active style
<NavLink to='about' activeStyle={{color: "red"}}>about</NavLink>
// If you use deep routes and you need an exact match
<NavLink exact to='about/subpath' activeClassName="active">about</NavLink>
Khadidja Arezki