check out the following video demonstrating how to examine Frames in the DOM Explorer:
You need to examine the frame in your own app and make sure the Frame in the Elements Explorer is configured accordingly to the frame found in the app.
Also, keep in mind that Frames also need to be taken into account when using BaseURL (see screenshot).
If you're still unable to make progress on this: the only alternative might be to go into a screensharing session where I walk you through configuring the frame.
All the best,
the Telerik team