For example, using the "CTRL + ALT + Up Arrow" shortcut can get you to landscape mode, while "CTRL + ALT + Left Arrow" could get you to portrait mode.
Tech Tip: How to change your monitor to portrait mode and why
How to Change Display Orientation in Windows 10 [Tutorial]
How to correct Screen Orientation under Windows 8.1 (Landscape/Portrait)
Frequently Asked Questions
Why is the screen on my iPhone not rotating?
Swipe down from the top-right corner of your screen to open Control Center. Tap the Portrait Orientation Lock button to make sure that it's off. Turn your iPhone sideways.