Things have changed. The multi view ports now seem to work a lot better than they used to.
Go to 2 views. In the left top corner of each view, left click and view option dialog appears. In first view, from small dropdown in top left corner, Choose (eg:) front. That view should now be front view. Go to the other view, top left corner, select 'left'.
That view should now be left view. Is this not working for you?
Oops. Reading more carefully, you're talking about Camera views?
Yes, the dropdown options in each view only give one camera option. They should probably also have 'other -> camera 2' as is in the main view menu.