To do Alt + H + F + S on Mac in PowerPoint, download and install Accelerator Keys, then press Option, followed by H, F, then S.
Command: Font Size
This is how to do Alt + H + F + S 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 + F + S focuses the Font Size dropdown in the ribbon, allowing you to type a specific font size or use arrow keys to select from preset sizes. Press Enter to apply the selected size to your text.