There was a large number of requests for Locking, Set Default View and Private View for Boards. That thread has many requests for all these requests, but since has been closed as Default view and Locking was introduced lately. The thread is here Lock views
But Private View that everyone asked hasnt been done yet and all the votes across the years has been lost and needs to start again. So request Monday to get this featuer of a private view (with filters) done.