Base Reports: How keep Report Header from forcing new page for detail

I want a report with a header that prints only once, no matter how many pages the report has. Based on the example in the doc I added a Report Header. Voila! It prints only once. But it forces a new page for the first detail item – in other words, it appears on a page by itself. How do I make the detail appear on the same page as the Report Header?

I have no Grouping defined and Force New Page is set to None everywhere I see it.

Version: 25.2.7.2 (X86_64) / LibreOffice Community
Build ID: 5cbfd1ab6520636bb5f7b99185aa69bd7456825d
CPU threads: 14; OS: Windows 11 X86_64 (10.0 build 26100); UI render: Skia/Vulkan; VCL: win
Locale: en-US (en_US); UI: en-US
Calc: CL threaded

Thanks,
Charles