To do Alt + J + P + A + Y on Mac in PowerPoint, download and install Accelerator Keys, then press Option, followed by J, P, A, Y.
Command: Rotate Menu
This is how to do Alt + J + P + A + Y 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 + J + P + A + Y opens the Rotate menu in PowerPoint. This provides rotation options including rotate right 90°, rotate left 90°, flip vertical, flip horizontal, and more rotation options.