HELP ME FIND THIS LIGHTNING PAGE TEMPLATE!!

Back at Dreamforce '19, there was a Service Cloud demo that was just so nice.... It had a pinned left sidebar with a header region that spanned the rest of the page, and then two columns under the header. The folks running the demo promised that it was a standard Lightning page template.

Fast forward to today, and I'm trying to build something similar, but I don't see that template! The only thing that is close is the "Pinned Left Sidebar (3 regions)" template, but it lacks the full-width region at the top.

I'm attaching a photo I took of the demo that I fell in love with. Hoping someone can tell me if I'm missing something in the template selection, or if this is actually a custom template. (and if it is a custom template, can anyone at Salesforce hook me up with the template code)