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Check and uncheck box

Windows shortcut 
Space
Mac shortcut 
Space

This shortcut will check and uncheck checkboxes in a dialog box. First select the checkbox using tab or shift tab.

222 Excel Shortcuts for Windows and Mac

Related videos

The videos below demonstrate this shortcut.
Shortcuts for Excel dialog boxes (Win)
In this video, we'll look at some tips and shortcuts you can use to control dialog boxes using only the keyboard.
Shortcuts for Excel dialog boxes (Mac)
How to use your keyboard to navigate dialog boxes in Excel for the Mac