No, Terry... you're looking at the Orth menu for
the entire AC3D interface.
Each window (Left, Right, Top, Bottom... but not the 3D view, which has its own version of this) has an Orth "sub-menu" in it. Your screenshot obscures it because of the "overall Orth" dropdown.
Here's an unobscured view...
Have a look at your interface again. Notice that each Orth window has its own submenu, which, with the exception of the 3D window, includes its own Orth. The 3D window has a "3D" dropdown submenu which supports its features.