

Pulling down the menu reveals the four Display Rotation options available to Macs, indicated by their degree of rotation as follows: There are options beyond the popular standard and sideways layouts for both built-in and external screens. Additional Display Rotation Options for Macs Mac OS X Mavericks and later reveals a few additional options alongside the “Rotation” menu, as do displays that are Retina compatible.

Here’s how to access the screen rotation option in all versions of Mac OS X: How to Rotate the Mac Screen Orientation into a Vertical Layout
