To do Alt + A M on Mac in Excel, download and install Accelerator Keys, then press Option, followed by A, M.
Command: Remove Duplicates
This is how to do Alt + A M 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 M opens the Remove Duplicates dialog. This powerful data cleaning tool lets you identify and delete duplicate rows based on one or more columns, keeping only unique values in your dataset.