I wasn't happy with the output UI in LensSim, so I've simplified it to show just the cardinal points, the hiatus distance, and the entrance and exit light cones, ie to/from the pupils.
The entrance light cone shows the field of view and the exit light cone ends up on the sensor plane.
The following shows the latest UI, but note this screen grab doesn't represent a real lens.
Hopefully this makes LensSim easier to read.
As usual I welcome any feedback on this post.