Looks like iTunes Connect (or is it App Store Connect?) is broken. Look at your browser developer console. You'll see JS errors. So looks their latest release is botched.
Perhaps someone who knows the right channels can notify Apple?
You'll see at least one very obvious error in https://appstoreconnect.apple.com/itc/js/gettingstarted.05318554a9.js. Line 43: const sessionMenu = ocument.getElementById('#session-menu');
Someone mistyped and forgot to run a JS checker on the code...
mjl-
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