Q&A for How to Fix a Rotated Screen

If there's an icon of a padlock encircled by an arrow on your status bar, Orientation Lock is on. Swipe up from the bottom of the screen to open Control Center, then tap that same icon to turn it off. The Display Zoom setting can also prevent your home screen from rotating; turn it off at Settings → Display & Brightness → View.

Minimize all open programs by pressing Windows key + D. Right-click any blank spot on the desktop. In the drop-down menu that appears, click Graphics Options, and then Graphics Properties. In the window that opens, select the Rotation tab. Choose your desired settings, click Apply, and then OK.

On the right side of your menu bar, there is an arrow pointing upwards on the Windows 10 version. Clicking on that opens a small dialog box. There should be a blue box in the upper left hand corner that might say "Intel HD Graphics". There you can rotate your screen by using the mouse on a angle.

If you are on Chromebook, you can right-click the menu and it will have 2 options always show/hide shelf or shelf position.