This is the Default / Icon View, and by the way Recent view is missing from the Sidebar
The List View. It is really handy that we have an always visible button to switch between views. But I guess they could merge this on a single button as there isn’t a 3rd view.
Options Menu with a fast zoom out option, which in a way can act as compact view.
Window Menu which would be better if it had Extra Pane option, but anyway.
Finally the Application menu. There is anything new here, but in case that we do not run a GS all these options move to the window menu [bellow]
..and without a running Gnome Shell things are getting messy.
This is the light/default theme of Nautilus, with the Recent View (that is missing from above figures) and the Bookmark View. Also this icon view is the with one zoom-out degree, just a handy replacement of compact view which has been drop from Nautilus 3.6.