Help › Light and dark mode
One switch, and the whole city follows it: the community, the classroom, Live Labs and these help pages.
The button sits in the top bar, at the right of the menu, next to the menu button on a phone. It always tells you what you will get, not what you are in:
You choose it once. Moving between the community and the classroom does not change it, and closing the browser does not change it either.
With no choice saved, the site follows your device. Change your phone or computer to dark and the city goes dark with it. The moment you press the switch yourself, your choice takes over and the device setting stops applying until you clear the site's cookies.
Why two looks rather than one. Light mode uses the platform's own light colours so reading long threads and lesson notes is comfortable in daylight. Dark mode uses the AI Universe City palette, deep green with teal and gold, for evening work and for anyone who prefers a dark screen. Nothing changes except colour: same content, same links, same lessons.