To see the total number of Visits or Unique Visitors for each website on any Matomo Custom Report, add the dimension Website Name as the first dimension for the custom report.

For example, create the dimension Page URL with the metrics Visits and Unique Visitors:

dimensions for matomo custom report

You can then apply any filter or add other dimensions and metrics to your custom report.

Note that unique visits is only available for the day period in custom reports. If you chose any period other than day, the metric will not appear in the report or the report may not be available. This behaviour cannot be customised or modified.

Previous FAQ: How do I get reporting data for dates in the past when I create a new custom report?