Nikon D3100 - Manual (Page 181)

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m Recent Settings
To display the recent settings menu, press G and select the m (recent settings) tab.
The recent settings menu lists the twenty most recently used
settings. Press
1 or 3 to highlight an option and press 2 to
select.
G button
A
Removing Items from the Recent Settings Menu
To remove an item from the recent settings menu, highlight it and press the O button. A
confirmation dialog will be displayed; press O again to delete the selected item.