expand the https://docs.github.com/en/graphql/overview/explorer window to fill the screen

expand.js

// run in the console
const x = document.querySelector("iframe");
document.body.innerHTML = "";
document.body.appendChild(x);
x.style.height = "100vh";

// then select the iframe #document in the element window and run
$0.querySelector("#graphiql").style.height = "85vh";