"John" wrote...
How could I prevent the change of the Zoom property Harlan?
....

Mine was a rhetorical question. Can't be done. While it may be possible to
disable or remove the Zoom entry from the View menu, there are other ways to
change the zoom setting. You could use the WorksheetSelectionChange event
handler to reset the zoom to 75, but that'd only be annoying. Just let your
users change the zoom setting as long as you have macros that'll reset it
every time anyone opens the workbook.