To do Alt + H B E on Mac in Excel, download and install Accelerator Keys, then press Option, followed by H, B, E.
Command: Erase Border
This is how to do Alt + H B E 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 B E erase Border removes borders by clicking and dragging. Your cursor becomes an eraser that removes any border it touches.