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Hide or show outline symbols

Windows shortcut 
Ctrl8
Mac shortcut 
⌃8

This shortcut toggles the display of outline symbols on the worksheet. Outline symbols only appear if the worksheet has at least some rows or columns grouped.

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.