Achieve Or Hide Completed Tasks
There has been a couple of these requests before but the suggested work arounds are not always the most helpful.
For us, we receive many tasks completed on a daily basis which is only likely to increase. It is also useful to keep the old tasks. Having a "Hide Completed" button would really help. That way we could always easily see which tasks have been completed since the last check. It would then allow us to use the filters again correctly.

You can even redefine Hide complete filter we create and show recently completed tasks but not task completed some time ago – https://blog.freedcamp.com/2017/12/19/see-recently-finished-tasks-even-hiding-completed-ones/
-
@Rob - it is on Kanban view see ... icon right after a task list name
-
Rob Sorrell commented
I have seen that this is on the list view but not the Kanban. Hopefully that means it would not be too difficult to add to the Kanban screen.