If you are referring to the way assignees' names appear in a task list, they show up in alphabetical order. This is not something that can be changed as it is the default behavior.
I realize this thread is a little dated, but I came here looking for this answer but I dont see it as alphabetical order
I've informed everyone that asked that this cannot be changed. But the next question they ask me is "then how IS it sorted?". In this case, this was a test I did. I entered the names individually, one at a time in this order:
but it displays as:
Can you provide anymore insight on how the names are arranged?