If you prefer to manually edit your configuration files, use the following syntax for this option:

topsites                10              (or another number, or all)

The How Many Sites? ^(topsites) option indicates how many of the highest-ranked sites should be shown in each report. By default, the top ten sites are shown. The sorting order is determined by the Top Sites Report: Sort by ^(sitesorder) option. You may specify any whole number of sites, or the word all. To turn off site reporting altogether, use the Chart Top Sites ^(sites) option.