The \"Settings\" menu is supposed to be the last menu, just after the \"Graphs\" menu.
Not having the \"Settings\" menu interferes with my ability to set Webhooks.
Ctrl+F5 was ineffective, at least in my case.
Clearing the cache and cookies is the nuclear option, and it worked - Although it hurts.
I double checked after the fact: the landing page issue I had was specific to my Chrome browser, at least in this case. The landing page, as displayed by my Firefox browser, was fine. Ditto for the Safari browser was fine.
Until today, I'd never heard of a case where a landing page rendering could be fixed by nuking cookies and cache.