Hovering over the green 'expand' button on any document windows, shows the full screen toggle. click when this is showing to enter the normal macOS full screen mode. It is not possible to use this for tear-off pop-up windows (e.g. Get Info, etc.) or for note text windows.
From v7.1.1, full screen split view is supported. In normal (non-full) screen mode press and hold the green “full screen” button in the main window’s upper left-hand corner; the window will shrink to permit the user to select the right or the left half of the screen.