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Open Ungroup Dialog Box

Windows shortcut 
AltShift←
Mac shortcut 
⌘⇧J

This shortcut will display the Ungroup Dialog Box as long as no whole rows or columns are selected.

222 Excel Shortcuts for Windows and Mac

Related videos

The videos below demonstrate this shortcut.
Shortcuts to group, ungroup, and outline
In this lesson, we cover shortcuts you can use to group and outline data.