Feature request/Feedback - Boards issue (app/iPad)

So first off I love the boards option and I’m using it for school.
I started on the app. But the app doesn’t allow you to hide completed tasks which is going to get super annoying as a semester goes on.
So I switched to the desktop site on my iPad. Which doesn’t allow you to drag and drop tasks to different boards.
I don’t bring my computer to school. I need you guys to fix one or the other or just add the feature to the app where you can hide completed tasks.
If I am somehow ignorant of how to do one or the other, someone please educate me.
Yes I am aware that you can delete tasks manually but that defeats the purpose of a task manager and checking off your tasks.