Google Earth User Guide - Manual (Page 44)

Showing and Hiding Places Data
Once you begin collecting a fair amount of place data, you can use the show/
hide features of Google Earth to quickly manage the amount of content
visible in the 3D viewer.
To hide places data, select or de-select the check box next to an item.
To turn off the display for a single placemark or overlay in the 3D viewer,
click the item to remove the check mark. To turn on a single item, select the
check box. For entire folders, you can turn on all items in the folder by
selecting the folder's check box if it is not already selected. In this case, all
items in the folder are turned on. A subsequent click turns off all items in the
folder.
Note - If a square appears in the check box for a folder, this indicates
that some (but not all) of the items within that folder are currently
displayed.
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