Each report sorts the table rows by the most-to-least visitors. You can click on any column heading to re-sort the table by that property.

Clicking Visitors will toggle the order from most to least visitors
On the first click, your data will be sorted by ascending values. For instance, the Title column will sort alphabetically (A-Z). The second click will sort the data by descending values (Z-A). Subsequent clicks will toggle between ascending and descending sorts.
If you find yourself needing additional flexibility when sorting, this might be a sign that you should try filtering your data.