After using "Zoom into a Group", to then restore the original view it's necessary to use a combination of "Zoom out"('s) and (probably) "Pan mode". It would be very useful if there was the ability to restore the previous View/Zoom by a single click. Apologies if that feature exists, if it does, I was unable to locate it :)
Closing some of my old bug reports that aren't being acted upon. (There needs to be a resolution category "Died - Old Age") To anyone on the "cc" list - please re-open if you feel the need.
*** This bug has been marked as a duplicate of bug 309867 ***