Press the Focus mode button or the F key and the disk fills the entire screen. Menus and text disappear, leaving only the disk, the time left and the start button — readable from across the room.
Put it on a classroom projector, an interactive whiteboard or a meeting-room TV and everyone can follow group work or presentation time together. While the timer runs, the screen is kept from going to sleep (in supported browsers).
Press Esc or Exit to go back. In browsers that don’t support full screen, it fills the browser window instead.