1. By default the filter is disabled. Did you click on the filter name, and use the Gear icon on top to Enable the filter?
2. The filter definition (if you double click on the filter name) is based on a specific connector profile
more about connector profiles here SolarWinds Knowledge Base :: How to create Connector Profiles to manage and monitor LEM Agents
So, you can either apply this connector profile to all your DCs or you can modify the filter to be explicitly on your DC names.
Ah! yes, that was it. After I plugged in my DC names the filter started lighting up.
Thanks for the article about the connector profiles, that was helpful too!