Many of us utilize a variety of TA's to help support our grading. These TA's are also students, who have their own tasks to complete to keep up on their academics. It's hard for student TA's to track their "to-do items" on their dashboard when they have one full to-do list for all classes they're TA'ing and all classes they are actually participating in.
I suggest creating two to-do lists based on your actual role in Canvas. A "To-Do List for TA's" and a "To-Do list for student assignments" to help our student employees navigate their own academics and support our students in our classes better!