To do Alt + H O U C on Mac in Excel, download and install Accelerator Keys, then press Option, followed by H, O, U, and C.
Command: Hide Columns
This is how to do Alt + H O U C 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 O U C hides the selected columns from view. The data remains in the spreadsheet but is not visible. Hidden columns are indicated by missing column letters and a slightly thicker line between adjacent columns.