I don't know when this got changed to this auto-truncate state but it is awful, the display names are useful for keeping track of simple things like AC and passive perceptions, it has been a habit for a few campaigns now to have them along with the character name for quick reference. Please return things to a state where display names don't get cut off or at least make it an option in the display section to toggle this feature on or off. It is a useful little bit of the UI that has it's uses and is entirely unobtrusive.