With a portrait monitor, this is especially great, as I can split-screen three applications at a time that are all in landscape mode, rather than two that are in portrait mode. Granted ...

If your screen doesn't auto-rotate from portrait to landscape screen orientation, you've likely turned off the auto-rotate screen settings. Here's how to turn it on using the Quick Settings menu ...

If you are using an AMD GPU, you need to use the keyboard shortcut CTRL + ALT+ LEFT to enable the Portrait mode and rotate the display 90 degrees counterclockwise. If you rotate your screen using ...