Just a quick tip (so I don’t forget 😉 ) – in full screen (now “Compose”) mode, if you set the paper color to white, then 82% on the grayscale slider (so that is a light grey), and set the current line highlight to white, 100% on the grayscale slider, what you end up with is a focus on the current line, but you can still read the rest of the page. Handy for focussing on the words you’re writing, not the words you’ve written!