To enable Dark Mode on your WordPress documentation website, you can use the Droit Dark Mode plugin.

Install & activate the Droit Dark Mode plugin from the WordPress Dashboard > Plugins > Add New & search for the Droit Dark Mode plugin.

And you’re done, after the activation process is finished you will be able to see a dark mode switch on both you’re front-end & back-end of the website.

By clicking on that switch you can toggle between the dark mode and light mode version of DDoc. From here, you have the option to leave the Droit Dark Mode plugin as it is with the default settings or you can personalize it from the Droit Dark Mode plugin dashboard.