I know that a lot of folks are struggling with the change to Campus Instruction on Infinite Campus. I completely understand! I'm going to be putting together screencasts on everything as well as offering trainings as fast as I possibly can. In the meantime, I found this Quick Reference Guide from Douglas County School District that gives you a really good guide to get you started with everything on Campus Instruction. I used it this summer to prepare for the trainings I offered in the beginning of August and it really helped me to understand it all. Click here to check it out!
I had a teacher ask me if there was a way to hide or remove students who are no longer in your class. The answer is maybe. It depends on if they are officially dropped from your class and appearing as red in your roster and gradebook. If not, then no, you cannot remove them until they have been unenrolled from the class. If the student is showing up as red in your gradebook though, you can hide them so you don't have to worry about them. Here is a screenshot to help you do it: