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