The following screen will appear when two documents are compared where at least one of them contains multiple sheets (given that 'Analyze multiple worksheet' is selected in the file-selecting dialog).
To compare two document revisions, select the desired sheet from the left box and then one from the right.
Press Preferences... to set the desired analysis method for the comparison.
The Sheets Analyze Dialog will remain on the screen even after a comparison is made. This permits you to make multiple comparisons within the same documents without having to restart CS-ExcelDiff.