Another way to get information from a report is to right-click into the report, and choose Copy. Then in a spreadsheet, click Paste.
This way you don't go via a file.
As Bob points out, you can Customize the report. If it is something you see doing again, maybe save the Customized report as a favorite.
For a one time deal, it is easy to delete columns in Excel.
As to the multiple column thing -- one for each payee, I cannot replicate that. The Transactions by payee report gives a single Payee column. If you are using "Essential" reports, I suggest Reports->ChangeReportSettings->SwitchFromEssentialToAdvancedReports. I think most of us use "Advanced" reports.