Hello Joel Housman,
The property actually sets e.Item.NavigateUrl of the RadMenuItem to an empty string which disables the url. As a result clicking the a group page does not make any redirect, because there is no url.
We will consider how to rename the property for Sitefinity SP4. Meanwhile you can do this in Sitefinity\UserControls\Navigation35\SiteMenu.ascx.cs where HideUrlForGroupPages is defined.
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