Can I ask a silly question only loosely connected to this post? In the gif, the editor looks like it’s bringing in nearly all of the front-end styles and like it’s this close to being a front-end editor. Can someone tell me how this is being achieved? (Like, I assume it’s set to Fullscreen Mode, but what else is going on here? Is that just Twenty Nineteen and how it has editor styles setup? How is it not looking like the generic Gutenberg UI?) Thanks in advance!