To do Alt + P B on Mac in Excel, download and install Accelerator Keys, then press Option, followed by P and B.
Command: Breaks
This is how to do Alt + P B 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 B opens the Breaks menu with options to insert, remove, or reset page breaks. Page breaks control where one printed page ends and another begins, giving you precise control over your print layout.