I write mostly during the night and the white of the page is quite difficult for my eyes, it's possible to have an option to have the same look (more or less of course) than this old soft :
Choose the "Tools | Options..." menu command. On the "Colors" tab you can choose a color scheme for the document window of Atlantis. Please try "Deep Blue" or "Sleepwalker's Fantasy".
The F9 key toggles the "Full Screen" mode in Atlantis.