Hi Traci,
Regarding freezing columns, I’m sorry to report there is no way to do this. A recently introduced feature to convert a case table into a case card might be helpful to you since it makes it much easier to work to work with a large number of attributes. But, then again, since you are also scrolling vertically, perhaps not.
Regarding hiding columns, there’s no interface for it. Sorry. There is a way to do it by editing the JSON text of the document, but I don’t think that is appropriate for either your situation or the situation you describe for students. We’ve received a number of requests for hiding columns through the interface and will likely provide it sometime soon.
Bill