I would like the Board view of epics to be customizable for each user, because different types of team members might have different parts of the sprint / story they want to focus on while looking at the board.
Examples are:
Collapsible columns. → Certain columns are of less interest to certain team members, and only 5 columns fit on a regular 1920x1080 screen
Editability of which attributes of a story to show on the tile