Rather than having it arbitrarily be the End of Time or wherever we are in the campaign.**
Thus if we like Council Chambers, to “set” that as our designated area all we have to do is make that our last town waypoint that we enter.
[Combat zones have no effect on changing the default TP.]
If you are running monos, then that’s your last designated zone.
**If you want us all to be in your campaign towns during the campaign and not give us the option, this ability could be unlocked at campaign completion.