How to rotate your monitor and use it vertically in macOS | AppleInsider

You don't always have to keep a display in a landscape orientation. Here's how you can turn a second screen into a vertical monitor, and to adjust macOS to work with it. One of the benefits of buying a new monitor is that you're not only potentially improving the image on your main display, but now you have two screens. You have a second display that you could feasibly connect to your Mac at the s

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似たような使い方してるけど、フルHDモニタを横向きで4Kモニタを縦向きという状態だったりする