If you want to display only Totals and Sub Totals on a Summary report, you can hide the row detail by clicking on Show and clicking on Details to untick it. For help creating a Summary report, please click here. 

The rows of results will be hidden and you will just see Totals and Sub Totals:

When customizing your report, where you are able to amend the date range you are also able to amend the report type, any additional features and save the report.