To do Alt + 9 on Mac in Excel, download and install Accelerator Keys, then press Option, followed by 9.
Command: Document Actions
This is how to do Alt + 9 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 + 9 opens the Document Actions dropdown menu. This provides quick access to document-related actions including renaming your workbook, viewing version history, and other file management options. It’s a convenient way to manage your current document without navigating through the File menu.