During data comparison, the following screen is shown
There are three tabs, one showing the currently running comparisons ('Active'), one showing the comparisons which are waiting to run ('Pending') and one showing the comparisons which have completed. The cancel button can be used to cancel the comparison process. Note that the cancel button can take a while to operate as the rows have to continue to be streamed from the SQL Server.
When the comparison is complete, we can view the differences.