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In the «Toggle advanced elements» menu, you see the first field for hiding and showing Messages, Action links, Tabs, .... It does not say what state an checked option will be. hide/show? It's hiding. (I'm using the german translation: Ermöglicht das Verbergen oder Anzeigen bestimmter Seitenelemente. = Allows you to hide or display certain page elements.)
In the second group it says «Choose from the elements below to hide them via CSS» thats clear: check = hide
It's just an usability request, that can be done clearer.