To do Alt + h 3 D on Mac in Excel, download and install Accelerator Keys, then press Option, followed by h, 3, and D.
Command: Double Underline
This is how to do Alt + h 3 D on Mac in Excel with Accelerator Keys, the native ribbon and alt key shortcut solution for Mac users who get more done with Excel.
Alt + h 3 D activates the Double Underline command in Excel, providing quick access to this feature from the ribbon.