There are two worksheets. The first takes its name from the Table Pair that was used to generate the spreadsheet. This worksheet is empty because there were no tests defined in the Table Pair. If tests had been defined, then those would be visible - one test per row - in the worksheet.
This worksheet should have 18 columns defined. These correspond to fields that are present in the Add Test dialog in DVO.
The second worksheet, Fields, contains the Field/Column metadata based on the Table A/B definitions in the Table Pair. This information is provided for reference purposes, and can be used when creating expressions or in other situations where the column metadata is required.