How to display a homework that has been removed/hidden/flagged as done by accident

When a student has done the homework, they should flag it as Done. The homework will stop displaying in the list of homeworks.
This function is useful for for both the students/parents and the teachers. The students/parents have overview of "to do" homeworks and homeworks already done. The teacher has access to up to date information about homework being done by the students.

In the mobile application: