hello scarsman, i think by default all bookmarks are sorted by their creation date - however you can right-click each folder and choose to sort all currently available entries by name. in the bookmark library you can click on any column (name, tag, last visit date, visit count, date added, etc...) to sort them as you want...

Note that sorting via the Views > Sort menu in the Library is only meant for viewing purposes and doesn't sort the bookmarks permanently like sorting a folder via the right-click context menu does.