To do Alt + H + J on Mac in PowerPoint, download and install Accelerator Keys, then press Option, followed by H, then J.
Command: Columns Menu
This is how to do Alt + H + J 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 + J opens the Columns menu, allowing you to split text in a text box into multiple columns. Choose from one, two, or three columns, or access More Columns for custom settings.