To do Alt + H B A on Mac in Excel, download and install Accelerator Keys, then press Option, followed by H, B, and A.
Command: All Borders
This is how to do Alt + H 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 + H B A applies borders to all sides of every cell in the selected range, including interior borders between cells. This creates a grid effect where each individual cell has its own complete border. It’s commonly used for creating tables, data grids, and structured layouts where you want clear visual separation between all cells.