The records behind a number
List the records a number is of, and open them in Explorer.
Show records
Show records (a double-click on a number, Enter on it, or its menu) lists the records behind it and says how many there are. An item's label has Show records in its own menu too.
Open in Explorer opens them as a column there, with the number's items as its conditions. Where a filter, a period or a range cannot be said as Explorer's conditions, the records are listed and the reason is said instead.