Fixed1
On a computer, the home page's first screen could show no folder. It now builds the 3D folder at any window width.
It was missing when the system reduces motion, when the window was narrower than 1024 pixels and the page started slowly, or when the browser offers no 3D (WebGL). Those cases now get the folder picture; on a computer, clicking it opens key creation and a small folder follows you in the left margin once you scroll past the first screen.