To do Alt + H L H D on Mac in Excel, download and install Accelerator Keys, then press Option, followed by H, L, H, d.
Command: Highlight Duplicate Values
This is how to do Alt + H L H D 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 L H D creates a rule to highlight duplicate or unique values in a range. This helps identify repeated entries in your data.