To do Alt + P H on Mac in Excel, download and install Accelerator Keys, then press Option, followed by P and H.
Command: Height
This is how to do Alt + P H 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 + P H opens the Height dropdown in the Scale to Fit section, allowing you to specify how many pages tall your printout should be. This helps fit long spreadsheets onto a specific number of pages vertically.