To do Alt + P B A on Mac in Excel, download and install Accelerator Keys, then press Option, followed by P, B, and A.
Command: Reset All Page Breaks
This is how to do Alt + P B A 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 A removes all manually inserted page breaks and restores the automatic page breaks calculated by Excel. This is useful when you want to start fresh with your print layout without manually removing each break.