Popover.Panel: open by default

[mme]

Can someone point me to the source code of this example in the docs?

https://headlessui.com/examples/react-popover-hero

I need to replicate this behavior (open by default).

The source code for the example on this page (https://headlessui.com/react/popover) is not exactly the same, as it starts closed.

Thank you!