Hi @dhuff and @carole_black,
There is no way currently for you to be able to control the internet simulator settings as a teacher but you can definitely tell students which things to have on or if you want.
The big thing for this version of the internet simulator is that its not really meant to test a students understanding of turning binary into ASCII. Once they see that ASCII can be represented in binary, the lesson is actually most focused on creating a protocol for sending formatted text. Protocols for formatted text include something like HTML which is completely written out with ASCII characters. The binary only remains in the window so that students continue to get that reinforcement that there is a connection between all these different representations.
Hopefully that helps clarify things a little bit. Feel free to shoot back any questions you may have.