If your display suddenly flips or you want to work in portrait mode for reading, coding, or design, rotating a screen is a quick, built-in option on most devices — and it’s one of those small, underrated tricks that can save time and headaches. This guide lays out every practical method to flip or rotate screens on Windows, macOS, Android, iPhone, and external monitors, explains why rotation sometimes breaks, highlights the most useful troubleshooting steps, and calls out risks and edge...