See Additional columns in Slide from Worksheet Object

Output from a web-based tool, provides PPT slides with embedded Excel sheet & defaulted to showing columns that fit slide.  There are some additional columns and rows that I would like to see on the slide.  I edit or open the Worksheet Object and enlarge the sheet so I can see data in all columns & rows, but when I close, the slide still just shows some of the columns.  Slide shows what is in col A:L & should show A:S.  How do I edit this to show additional columns?