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There is now a navigation tool for star charts. It's in the upper left part of the chart display. With it, you can retarget the current chart, choose different zoom levels for many charts, and return to a "Home" view if you've been viewing from remote locations.
Additional details after the break:
The Zoom In and Zoom Out options are only available when the chart type is "Atlas", since this type has 16 distinct zoom levels. The other chart types (such as Naked Eye or Classic Atlases) turn these options off. For this reason, the "default" chart type has changed from Naked Eye to Atlas.