To do Alt + H + G + O on Mac in PowerPoint, download and install Accelerator Keys, then press Option, followed by H, G, then O.
Command: Rotate Menu
This is how to do Alt + H + G + 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 + G + O opens the Rotate submenu, providing options to rotate objects 90 degrees right or left, flip objects vertically or horizontally, and access more rotation options.