To do Alt + A G G on Mac in Excel, download and install Accelerator Keys, then press Option, followed by A, G, G.
Command: Group
This is how to do Alt + A G G 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 + A G G group collapses selected rows or columns into an expandable outline group. This helps organize large datasets by hiding detail rows while showing summary totals.