If a student learns EN _from CS_ and SV _from EN_, Dashboard shows only either EN or SV course.
If a student enrolls in multiple courses with different source language, Duolingo Dashboard shows me only courses from the language that the student has currently set as active UI language.
It is a similar problem that https://www.duolingo.com/comment/7438121 already reported.
I wish to be able to see all courses the student is working on regardless of the source/base language.
It's because the base languages are different, The base language for your EN course is CS, and the base language for SV is EN. You cannot have both up at the same time because the base languages' are different. You must switch from one tho the other. There is no way at the moment to show courses with a different base language at the same time.