Hello @koperm1
Thank you for contacting the Canvas Community. We're sorry to hear you've been experiencing issues with removing old courses from the canvas app. Students can manage their dashboard courses the same on a browser and mobile app:
https://community.canvaslms.com/t5/Canvas-Student-Android-Guide/How-do-I-manage-Courses-and-Groups-i...
There are multiple ways to end and remove old courses from student access as well. One one would be having an end date on course settings and "restricting" student access after the end date. Another would be using student access dates on the term associated with the course. Hopefully this helps!