Might need some screenshots to see exactly what you mean. My toolbar doesn't change at all between Code View and Book View (except that a few items get disabled/greyed out). The various toolbars can be added/removed via the standard "View->Toolbars" menu method, but there really should be no change in the visible toolbars when switching between BV and CV. The only thing that happens is that the inapplicable items become disabled (but still visible).
Are you perhaps talking about an undocked Preview widget that you've enlarged? If so ... it won't have any toolbars (close button).
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