Where can I find the "Immediate Mode" sample mentioned on the ECS Physics page?

On the Unity Physics > Design Philosophy page, under the section “Modular”, in the second paragraph, it says

As an example of this, see the Immediate Mode sample. It steps a physical simulation multiple times in a single frame, independent of the job system or ECS, to show future predictions.

Does anyone know where that sample is? I have no idea where to find it.

You can find the ECS samples on GitHub (physics samples readme), with this one specifically being here.