To do Alt + H + A + L on Mac in PowerPoint, download and install Accelerator Keys, then press Option, followed by H, A, then L.
Command: Align Left
This is how to do Alt + H + A + L 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 + L aligns the selected text to the left edge of the text box. Left alignment is the default and most common alignment for body text in presentations.