Data missing from the report in preview and export to excel

Hi ,

I am using CR 2008 version to create a report.Existing report. The issue is when there are many columns, it is not showing all the columns in the preview or export to excel.  But if I select export to excel (Data only) option, it export ALL the data , including the data I do not see in the crystal report preview.

This is a Landscape report and I tried to increase the horizontal width under the page setup option.That did not help.

Could someone please help to resolve this issue? Thanks.