To do Alt + H + F + K on Mac in PowerPoint, download and install Accelerator Keys, then press Option, followed by H, F, then K.
Command: Decrease Font Size
This is how to do Alt + H + F + K 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 + K decreases the font size of the selected text by one increment. Each press drops to the next smaller preset size (e.g., 16 to 14 to 12), making it quick to shrink text step by step.