To do Alt + H + T + 1 + X on Mac in PowerPoint, download and install Accelerator Keys, then press Option, followed by H, T, 1, then X.
Command: Expand All
This is how to do Alt + H + T + 1 + X 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 + T + 1 + X expands all sections in the slide panel, showing all slides within each section. This gives you a complete view of all slides in your presentation, useful when you need to see the full slide thumbnails after having collapsed sections.