Got that annoying feeling when pictures just won't turn to landscape mode when you want to show one on a larger screen real estate. It used to work, what happened? Well, someone pressed the autorotate button, that's what. Screen rotation displays content in landscape (horizontal) or portrait (vertical), and isn't available for all apps, but Samsung's One UI actually allows you to rotate the whole interface in landscape mode, too.
Here's how to make the screen auto rotate for larger pictures and landscape interface mode:
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