There is no builtin shortcut for that you would have to create your
own macros and shortcut key, or assign it to a toolbar button
Toolbars, Custom Buttons and Menus
.
http://www.mvps.org/dmcritchie/excel/toolbars.htm
Sub toggle_comment_indicator()
If Application.DisplayCommentIndicator = xlNoIndicator Then
Application.DisplayCommentIndicator = xlCommentIndicatorOnly
ElseIf Application.DisplayCommentIndicator = xlCommentIndicatorOnly Then
Application.DisplayCommentIndicator = xlCommentAndIndicator
Else
Application.DisplayCommentIndicator = xlNoIndicator
End If
End Sub
You can check existing shortcuts so you don't override something else
Shortcut Keys in Excel
http://www.mvps.org/dmcritchie/excel/shortx2k.htm