To do Alt + H + A + X + O on Mac in PowerPoint, download and install Accelerator Keys, then press Option, followed by H, A, X, then O.
Command: Rotate all text 270°
This is how to do Alt + H + A + X + O on Mac in PowerPoint with Accelerator Keys, the native ribbon and alt key shortcut solution for Mac users who get more done with PowerPoint.
Alt + H + A + X + O rotates all text in the selected text box by 270 degrees (or 90 degrees counter-clockwise). The text reads from bottom to top, useful for vertical labels on the left side of charts or diagrams.