Copilot Studio - how do I get it to look at my datasource first?

Hi all;

I created a Copilot in Copilot Studio. In it I pointed it to my app's documentation as the knowledge.

In the Generative AI I set it to use Generative (preview) to have it generate the Topics for me.

I then posted the question "How do I create an Event?" An Event is a major item in my documentation. The Copilot answer told me how to create an Event in Outlook.

How do I get it to use my documentation first? My goal is to not have to write any topics and instead have Copilot figure out answers, going first to my documentation.

thanks - dave