In Android Studio, in StarterSampleActivity.kt, change your code to match this code block by adding the code preceded by a + and removing the code preceded by a -.
The code introduces a panel { } section. The panel gives you a hook to execute code on UI elements within the panel. Once the WebView is retrieved from the rootView, you can modify settings on it and load a URL into it. loadUrl() is also a standard Android method. To learn more about it, see LoadUrl.
The code deletes the width and height settings in the config { } section because Spatial Editor is now providing these values.