Google-Gemini Starter-Applets Map Explorer missing Gemini prompt section (left panel) when run as standalone locally

Google AI Studio
1

Brief recap - Windows start local server: python -m http.server and http://localhost:8000 or http-server, did get the map only. See visual:

Additional calibration - A) switching between Chrome and Edge: same outcome, and B) Spatial Understanding applet: same result (missing left panel).

Q: how do I get the System Instructions and Prompt (on the Left) of Starter Apps up?