To do Alt + H + K + L on Mac in PowerPoint, download and install Accelerator Keys, then press Option, followed by H, K, then L.
Command: Line Spacing Options
This is how to do Alt + H + K + 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 + K + L opens the Paragraph dialog box with line spacing options, allowing you to set exact line spacing values, spacing before and after paragraphs, and other paragraph formatting options.