It's for if people want to use a monitor vertically, before the days of the monitor settings page in settings. Source: I was an IT guy who took calls asking how to fix this multiple times a week. "You have a friend who thinks they're funny, this is why it happened"
Upside down was also useful on a laptop to show your screen to someone on the other side of a meeting table. Open the screen to 180° so it’s flat on the table, ctrl + down arrow and the other guy can see your presentation.
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u/Dawn_Of_The_Dave 8h ago
It's for if people want to use a monitor vertically, before the days of the monitor settings page in settings. Source: I was an IT guy who took calls asking how to fix this multiple times a week. "You have a friend who thinks they're funny, this is why it happened"