Grid is a third look next to Light and Dark. Settings > Look and feel > Theme > Grid (also in the gear menu).
WHAT CHANGES: a black screen with a faint grid, cards and buttons outlined in neon cyan, orange as the second color where ATOM normally uses pink, and page titles in a futuristic font. A thin cyan line runs across the very top of the screen with a light that rides it every 24 seconds.
WHAT DOES NOT CHANGE: every screen, button and number works exactly the same; it is Dark underneath. Money still shows every amount to the cent. Printed day sheets, PDFs and exports never use Grid.
MOTION: the moving light follows Glow: Glow Off, or Reduce Motion on your phone or computer, keeps it still.
IT FOLLOWS YOUR LOGIN: pick Light, Dark or Grid once and your phone, laptop and Mac app match the next time each one signs in. Tap Dark or Light to switch back.