To do Alt + H L on Mac in Excel, download and install Accelerator Keys, then press Option, followed by H, L.
Command: Conditional Formatting
This is how to do Alt + H L 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 opens the Conditional Formatting menu where you can apply rules that change cell appearance based on their values.