To do Alt + N M 1 on Mac in Excel, download and install Accelerator Keys, then press Option, followed by N, M, and 1.
Command: SmartArt Menu
This is how to do Alt + N M 1 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 + N M 1 opens the SmartArt submenu with categories for different diagram types. SmartArt graphics help you create professional diagrams for processes, hierarchies, relationships, and more with just a few clicks.