That appears to be it. I made a new menu and started horizontal. Then I could change it to vertical without a problem. It still seems to be a glitch. I should be able to create a menu with a separate default vertical and horizontal profiles. If I want to make a menu with some space between the menu and the fly-out menu, those settings have to be different between vertical and horizontal, but it does not appear to do that (or gives me no confidence that it is doing that). I should be able to pick a theme and switch between vertical and horizontal menus that both match the theme look and feel without adjustment.
Right now I made a vertical and horizontal version. I have not made many yet, so I might be missing something.