Now updated to Ver 0.11 (script and zip above - the zipped version has the icon).

Now faster, and perhaps more practical - toggles between two windows (home view and remembered narrow view) rather than just transforming the front window. (If either window is missing, it will create them).

Usage: install in toolbar and click it from a narrow view to return to one in which all is visible. (It will remember the narrow view, and return to it on the next click of the script).