Toggles the Navigation Bar’s Compact mode on or off.
true, if the Compact mode is enabled; otherwise, false.
By default, the NavBarControl functions in Compact mode. Disabling this mode for the NavigationPane View will hide all visual elements, leaving only the currently active group and its items visible. Do this only if you use the Navigation Bar as an item source for an Office Navigation Bar. Otherwise, leave the Compact property in its default state. See the Office Navigation Bar article to learn more.