To do Alt + J + P + Y + 1 on Mac in PowerPoint, download and install Accelerator Keys, then press Option, followed by J, P, Y, 1.
Command: Reorder Objects
This is how to do Alt + J + P + Y + 1 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 + Y + 1 opens the Reorder Objects pane in PowerPoint. This allows you to visually rearrange the stacking order of all objects on your slide using a convenient drag-and-drop interface.