Currently, it seems that there is no way to click a column to sort using a different field in the member directory (on the member side of elvanto).
It would be nice if we could sort a list by first name or last name.
If you switch to 'list' in the member directory, there is a 'sort' button, but it currently does nothing.
Thanks for the post
At this stage it's not meant to be sortable. I'll put a feature request in for this though.
Hope this helps,