To do Alt + H 6 on Mac in Excel, download and install Accelerator Keys, then press Option, followed by H, 6.
Command: Increase Indent
This is how to do Alt + H 6 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 6 increase Indent moves the cell contents to the right within the cell. This adds visual hierarchy and is useful for creating indented lists or subcategories.