I'd love to be able to enable split-screen (top/bottom windows) with two separate views in the document. Either via a button or click and drag an icon to size the windows. I often write notes in a later chapter that I want to use as beats in the chapter I'm using, or refer to other text somewhere else in the novel while I'm working on a scene. Currently, I have to swap between those views and copy/paste the text in question into the scene I'm working on and sometimes jump back and forth between them both many times. Such a feature would allow the text you're working on to remain in one window, while you used the other window to look at reference text, or notes, etc. somewhere else in the novel and delete or move or manage those other notes when complete.