To do Alt + W V G on Mac in Excel, download and install Accelerator Keys, then press Option, followed by W, V, G.
Command: Toggle Gridlines
This is how to do Alt + W V G 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 + W V G toggle Gridlines shows or hides the cell gridlines on screen. Hiding gridlines can make your worksheet look cleaner for presentations.