To do Alt + H B N on Mac in Excel, download and install Accelerator Keys, then press Option, followed by H, B, N.
Command: No Border
This is how to do Alt + H B N 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 N no Border removes all borders from the selected cells. This clears any existing border formatting while keeping other cell formatting intact.