Changing Orientation on only one sheet (not all)

[RayMeiers]

I have used Visio 2010 for several years.  I have always been able to change the page orientation among sheets of a single Visio file (Fig 1 could be portrait and Fig 2 could be landscape).  I could make changes without affecting other sheets by using the orientation button on the design tab.  I must have accidentally changed some setting and now can't do it.  Every time I change the orientation for one sheet, all are changed.  Do you know how can I get back the functionality I have lost?